Ok so, keep in mind that i'm a new convert from this year to mac's and OS X, aside from in school back in the original iMac days, and ohh gawd I remember a mac classic way back when I was using an IBM Personal system II at home, and long before I actually knew how to use them, but overall OS X is new to me, and I've not tried Mountain Lion yet.
On the opinion that Mountain Lion is a boring release.
Mountain Lion isn't being called this, but really it seams like a paper cut release. It fixes a bunch of small annoyances and improves performance. It's like Windows 7 was to Vista. When you have a short release schedule then you need to take a break from adding new features and just fix things up a bit, add some polish so that everything is in a good state to move on with. Papercut releases tend to be some of the best releases in the Linux world. Everything stabilizes for a bit before being shaken up again by new features.
On the integration of iOS features
Coming from the world of Ubuntu and Windows... Things work together? How is this not magic? People complain about this as being cheap to just tack on iOS fluff. Can you not see that this is Mountain Lion's innovation? This is what Windows 8 is all about. It's the vision that both Microsoft and Apple are chasing. In my opinion Mountain Lion fails in this regard only because it's not pushing this aspect fast enough, and because iOS it's self is ready for some new innovation, but iOS 6 also got the paper cut treatment this time around.
On AirPlay
AirPlay is being held back by the Apple TV. It needs to work from iDevice to iDevice to Mac and Mac to Mac and back. It should be AirDisplay on crack, but it slacks. <- sorry, I may have had a little rhyming moment.
On finder
OMFG can it even be called a file browser when it's so very basic? I understand Apple's want to keep it simple, but when you do real work, real work with files and things it just plain out sucks to use. It makes me miss nautilus so very much, which happens to be an absolute pleasure to use for maintaining a local LAMP server with. I have not considered running a MAMP server yet, and I don't think that I will anytime soon. I'm just so thankful that FileZilla works on Lion. I've heard that forklift rocks too, I've bought it, but haven't used it yet. I think my biggest gripes are the lack of right-click new file, and having to right click it's dock icon and open a new window from in that menu. Small complaints, but they waste so much time.
On the OP's rating system
I haven't seen that one before. When I read your post the first time I thought you were giving them all zero's.
On autosave
This works, what's not to like about it? I honestly don't see needing Save As when duplicate works fine, and possibly even dandy as well.
On Apple killing off finder/filesystem
Well this could be really nice, or really really terrible, depending on how it's done, if it's ever done. It would be nice to have OS X's filesystem stay the heck out of the way. I don't want or have any need to ever see it. I would like to see my little app icon's in launchpad, and have my dock moved there permanently too. I would like to never see third party apps cluttering up my toolbar, similar to iOS, and when I have a need to digg into an apps files it should be a right click option on the app's icon to take me to it's nicely sandboxed directory. The rest of the file system (Home directory, external drives, independent partitions, remote servers, ect...) should be mine to use and abuse however I see fit. If I want I should be able to drag one of my app's icons onto a USB drive, and BAM! (with a painfully slow USB transfer rate) it's there, with it's whole sandbox directory ready to be run on any Mac, from the drive, or installed into launchpad. I mean we do have Apple id's for a reason, so why not use that to enable app portability?
I think that's enough typing for now.