This is the same story I've heard everywhere, but have there actually been usability studies to show that flat buttons are somehow more user-friendly than 3D bu

This is the same story I've heard everywhere, but have there actually been usability studies to show that flat buttons are somehow more user-friendly than 3D buttons? It seems like most people's gripes are with the fact that skeuomorphism supposedly led to designs like Apple's Podcast and Find My Friends apps. I'd argue, though, that those app designs didn't suck because of skeuomorphism; they sucked because they were overdone to the point of not relating to reality at all anymore. No one uses tape decks anymore, so clearly that was a paradigm that fell flat completely, and Find My Friends, instead of going for a radar look or something similar, decided to go for an overly-puffy address book-type thing that just looked awful and cluttered. My problem is now that no button is safe without being criticized for looking clickable, or in other words, exactly like every other div and text field on the page.