Design-wise I'm ok with iOS7 except for a few areas such as:
The messages app - awful colours there.
The flat icons, and especially the childish system icons.
I'm ok with the functionality and performance except for:
Significantly worse battery life compared to iOS6
It's more buggy than iOS6
iOS7 has highlighted how low on RAM iDevices are - the Safari browser causes numerous problems if you actually utilise the increased tabs given to us with iOS7 (page refreshes and crashes).
The music app.
As for what it actually brings to the table in terms of new features, well aside from the control centre there isn't anything that I use. Airdrop is redundant for me and I don't much care for the new multitasking. So those who claim that iOS7 brings a host of show-stopping new features, well it really doesn't for the average user.
So, for me, iOS7 is a work in progress. I like some elements of the new aesthetics and I loathe some of them too. Performance is what really matters to me though and I really feel that iOS7 is hindered by the hardware. Perhaps the iPhone 6S, along with some software improvements, will finally show what iOS7 can do. I doubt that the iPhone6 will be the RAM-laden beast we require, but it just may be. Fingers crossed eh!
Time for the "iOS7 is fantastic and the 5S runs it perfectly" posters to show up