Overall I like it.
Pros:
-Looks nice, sleek, smooth, the new font looks cool
-Battery life APPEARS to be improved but i'd have to do alot more testing to determine that for sure
-The camera is definitely better though i never really had a problem with it in the first place, ICS adds a few new features too (for both the camera and video)
Cons:
-Few new bloatware apps but who's really surprised?
-all the apps show a "Please Wait" window for a minute the first time you use them but after that they work as they did before
-overall ICS doesn't really bring anything completely new to your phone after you upgrade so don't expect to have your jaw drop but you should be very pleased with teh small improvements
-face lock or whatever it's called is still as much a gimmick as it was on paper. i haven't used it myself but apparently it has some obvious faults (apparently it can be unlocked by using a picture of your face or when wearing sunglasses or doesn't work when your face is slightly angled)
That's the most basic review i can make, but it's best if you all try it out for yourselves. Or just ask me any questions you may have and I'll try to answer them.