Top:
- Hiding stock apps
- Close all Safari tabs
- more 3D Touch
Flop
- Slide-To-Unlock removal
- New control-center (extra swipe for music)
- Bold header fonts
- App store search ads
However complaining in this forum does not help. Write Apple feedback
http://www.apple.com/feedback/
your list matches fairly closely to mine. I don't mind the slide to unlock thing, I have a 6s though but sometimes I have to wonder why I need to click the home button to get it to recognize my finger print. I mean I already lifted to view and then when I touch the sensor I need to actually click it. In the scheme of things though I suppose it makes sense so that you can view your notifications without accidentally, out of habit, unlocking screen with the super fast recognition.
EDIT (wanted to contribute to the list)
Pros
-Mail view is awesome after I figured out how to show in date order, most recent first
-widgets are awesome but some just don't work yet, even the apple native ones (expected)
Cons
-some of the gimmicky additions to messages. Don't get me wrong I like a lot of them but drawing for instance, if you take to long to draw a picture (like switching colors) it can send the message before you are done drawing what you wanted to send causing it to break into two messages (i.e. drawing a smiley face and changing colors the eyes sent before I could finish the mouth). I have a feeling this will be fixed or I am just "doing it wrong". Already sent feedback on this one.