After playing with it today, I like it more than when I first installed it.
I do however think it looks way too plain in certain areas, a lot of the icons are just turd (what is that Game Center thing all about), and there a few pointless things put in to make it look neat and pretty as opposed to useable.
Oh, and why has my Gmail account suddenly decided there are 1722 unread emails in my inbox on iOS?; consisting of really old ones I assume. I don't deny that I haven't read them but I had it display only the days new & unread emails before...
I do like the keyboard, new ring/alert tones, background app updating, new multitasking, control center (although poorly placed) and dynamic wallpapers, so it's not doom and gloom...