After updating to iOS 5 and now adding iTunes Match, I noticed that you can't make genius mixes within the music app on the iPhone. I haven't checked my iPad yet. Anyone else notice this?
iTunes Match is very half-baked on the iPhone. None of my playlists sync and it takes forever to download tracks (over wifi). I think I'm going to return to manually syncing my phone, but I'll continue using iTunes match to keep my home and work computers in sync.