I actually like the new look, a few of the icons seem off, but I bet they grow on me. The transparency and layers makes a ton of sense to me. Really love control center, I can't wait to have easy access to my brightness. New Photos app looks amazing. Airdrop will be fantastic. New background / multitasking is a huge win.
Biggest let down, no inter-app communication improvements. I think that's a huge problem on iOS now, one I was hoping would be addressed.