This is the worst thing about the App Store. On Android, you have 24 hours to get a refund after you buy an app, FOR ANY REASON. I have no idea why Apple doesn't do this. I'm hesitant to spend money on something that I'm not even sure if I'll like.
And while I'm complaining about the App Store... why are there no sub-categories?!? On Android, I can go to Games, then narrow it down... Puzzle, Arcade, Action, Cards, etc... On Apple's App Store, I can go to Games and sift through every single game ever uploaded. Lame.
On the Android forums, people always complain about how the Android Market isn't as good as the App Store, but I honestly don't see why...