Devir Kahan on the Apple-applied icon gloss in iOS (he dubs: iShine):
In my opinion, this Apple shine on all apps looks nothing short of terrible. It makes icons appear bubble-like and juvenile. By far and away the best icons are the ones without this annoying shine.
When I finished reading this I thought for sure that he was wrong. I headed to my iPhone and searched for just one example of a good looking App icon that left the Apple shine in place — I failed to find one.