My experience so far, on my iPhone 6s:
Passcode screen: I don't use TouchID, so I get to see the passcode screen when I wake the phone. When that screen went flat in iOS 7, and the digits got thin round circles around them in later updates, I thought it looked very elegant. The new digits lack the thin circles, and it looks equally as good. These weren't just changes for the sake of change. When Apple gets design language right, they really get it right.
new fonts: I really like them. I recall the crying when iOS 7 switched to lighter-weight fonts, and I hope its not those same people crying now that they got heavier fonts. I liked the look of 7 vs 6, and I like the look of 11 vs 10. I find the screen is a lot easier to read, especially in bright sunlight.
Control Center: this is about the best its ever been. I really appreciate the ability to modify the Center- at least, as much as Apple allows. I removed the Camera and Flashlight - two things I never use - and I added Notes and Alarm- two things I use slightly more than never, but I'd still like to be able to get rid of the Do Not Disturb button. I have never used that feature, instead I just turn the phone to silent. Of course, based on the stuff I've read here that might no longer work. We shall see.
Clock: I opened it just now to see what has changed. I was greeted with a splash screen for "Introducing Bedtime". Reading the explanation just made me cringe. This is one of those instances - like "Breathe" - when I see the nanny attribute in modern society spreading into Apple. I'm not in a boarding school, I'm not in basic training, I don't need someone telling me its time for bed.
Next up: "Introducing Laundry Time: doing laundry regularly can increase your health and well-being. Answer a few simple questions to set up a reminder when its time to start your washer, and a recurring alarm to let you know its time to fold your laundry and put it away."
There are people who need this, and that makes me sad for civilization. Oh well.
Weather: a few subtle changes but the big one is the info is presented in a much nicer way. Two columns of relevant data in an easy to read format, instead of the old line by line scrolling. Nicely done.
Maps: Hoo boy, am I not happy with this one. After my upgrade, I noticed that traffic details were no longer appearing on maps. I had previously enjoyed an excellent level of detail on road conditions, so much so that I deleted Total Traffic as well as my local news channel's traffic link. It was worth putting up with the constant "Location Services are not turned on" alert every time I brought Maps up, just to have a good map. Now that alert is gone - thankfully - but now my road conditions are gone. I checked and the Traffic slider is green in Maps Settings. I have to turn off the slider and turn it back on to get the conditions back on the screen. Thankfully the data is still available, and all I have to do is toggle that slider, but I shouldn't have to. Hitting the home button and then going back in to Maps doesn't mess with the road conditions, and neither does quitting the app and then relaunching it. But at some point - a few hours or a few days later - traffic turns off once more and I have to toggle the slider. Whats that iOS bug report link again?
Calculator: the new look of the Calculator itself is fine. The new buttons are round, and evoke the Passcode screen digits. Whats up with that app icon though? A stylized calculator floating on a grey square? It looks out of place against all the rest of the icons.
Files: the one thing I was really looking forward to was the new Files app. Based on Apple's own released information and Keynote explanation, a lot of us thought we were going to have a true file manager. Instead we're greeted by some weaksauce file browser that attaches to cloud storage and does what you could always do with the web or app-based file management all of those services offer anyway.
Why couldn't they have gotten this app right? Even if it only handled email attachments and stuff created by installed apps, it would have been awesome. Imagine getting an email from a friend with a PDF or JPG attached. You could have 3Dt'd it to save the file to Files, and then deleted the email. Now I have to either keep the email so I can review the file on the phone, or go home and text/Airdrop the file from my home computer back to the phone so I can delete the email.
So what is this thing? Files is basically the TV app for cloud services. What a waste of space, just like the TV app.
Compass: It stopped working? Its frozen on 359 degrees, no matter which way I point the phone. Thats going to suck when I go for a hike off the trail, which pretty much describes my entire property.
What remains: There is still no way to delete apps that I don't want. I can now delete Reminders (never could get it to work) and News (I'm not a fan of any company learning in such detail what I like to read, or even worse, giving them an opportunity to try to mold my opinions), but I still can't get rid of Health, Activity, and Find My iPhone? I guess a case could be made for FMi being part of the OS codebase, but the other two? Plus, the Health app data keeps growing, even though I have never turned it on. That means its gathering data on me, and that data can't be deleted. Its actually the one data filed in storage management that I can't swipe and delete.
I'd really like to make all that stuff go away on my Watch as well, but thats another topic.
Performance: it seemed like battery life got worse after the update, and then improved a bit. Still, I get in my car at the end of a workday and see I have 30 percent battery left, as opposed to the 55-60 percent I used to see. My daily phone usage hasn't changed, so I'm not sure where the "leak" is at.
Overall: There's enough that Apple got right in iOS 11 for me to enjoy it, and enough new quirks to get me wishing they'd leave stuff alone sometimes. I guess there are more people with usage cases that require these tweaks. I'm sure a lot of this has to do with more and more people finding ways to put their entire life on their phones, alone with Apple finding more and more ways to get people to do that. I think thats great that people have found so much usefulness for these devices, but I could never be the guy who lives life off of Evernote, OneDrive, Facebook, WhatsApp, Instagram, or whatever. As a matter of fact, I've never used any of those apps and I can't even think of a reason to use them. I'm getting left behind by what these phones can do. So be it.
I like the update, but then again I have liked most of the updates including the ones that have been greeted with rage, like the iOS7 flattening. The one thing that made me mad enough to resist switching for the longest time was iOS 10 and the elimination of swipe to unlock.
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Bu-bu-bu-buggy and battery is draining fast.. especially the screen rotation bug is terrible. Airpods volume controller is messed up.. ypu never know the state of te volume and when ask siri to increase the volume it jumps from 25% to 75% or so...
You're telling an automated assistant to raise the volume of a device that you have at hand? That seems to me like telling my car to make a left turn when I've got my hands on the wheel.