Well, I got the update and was able to play with a bit. My criticism/gripes (and issues due to personal preferences) are as follows (I'm aware a bunch of this has been covered already):
I knew the temperature display was gone from previous posters/pre-release videos, but it still bothers me a great deal.
The compass is entirely useless (I can only imagine how people with the upgraded rear-view mirrors feel. I'm sure three different compasses all displaying the exact same thing are super useful.) and would much rather have something like a compressed calendar or the date, that would be a far more expedient use of the space.
The lack of the artist/song on the entertainment tab for Sirius on the home screen is insane. I almost didn't do the upgrade for this alone and experiencing it kind of makes me wish I didn't. I thought this was upgrade was supposed to make the most important information more easily visible.
No track end time for USB, Bluetooth, or CD makes no sense and there is absolutely no excuse for not having it. The space is there, use it.
The Climate display on the home screen is mostly useless now as well as it provides no information other than the current target temperature for both sides. What mode am I in?
Someone didn't run spell check on their strings when they were typing them up. Nice QA job...
When I plugged in my USB drive that has my music it began indexing. Shortly thereafter, it stated that it had finished and was building media commands. A bit after that, building media commands disappeared. I attempted to use voice commands to play music and it stated that it was still indexing and I would have to wait. It then showed index complete once again, followed by building media commands, which went away after some time yet again. Tried again, sync told me the same thing. This went on for several iterations before it finally let me do anything.
When it misunderstood me for the first time and couldn't find a matching command the information prompt was excessively long. You can say this command, or this command, or this device, or call Ford at this number for support. Really? I hope this is a one time thing because that's just annoying.
The fade-out/in animation makes my skin crawl. I have never liked that effect and it makes things look choppy. If it is using that time for calculation I would much prefer it did absolutely nothing and switched when ready.
I had to re-pair my phone for whatever reason. This may not be a sync thing though, my phone has been doing some weird things lately.
The volume increment display is very annoying now. Why does it only update the bar every other increment?
Favorite buttons are now useless. How did nobody notice this when testing?
The information quadrant has zero feedback (audible tone) when it is touched. This just makes it seem apart from the others. No clue why this was done this way.
I don't know why, but after the upgrade I seem to have to push the buttons longer than I did before otherwise it doesn't recognize the input. I've found myself having to touch buttons multiple times before it actually notices I have touched it.
Also noticed that several times (at least 4) during usage (I was stopped and the car was off), sync warned me about the dangers of driving while distracted and that some features would be unavailable while driving. Not sure why it did that.