30 FPS is less of a problem if the deliver is able to truly lock the FPS, but all too often we see developers claim they have locked at 30 FPS and it still dips into the low 20s on occasion and thats what is annoying more than anything. The fluidity of 60 FPS is a deal breaker in multiplayer, but I would never hold off a good game for being 30 FPS in single player if its solid.
I gave up on Bayonetta on PS3 for this reason. It wasn't the right call, because the game is legendary but the FPS dips was too gruesome, and such a splendid fast action game deserved to run more smooth than it did on that console.
As a high FPS enthusiast I understand the entitlement about demanding good FPS in games, but at the same time, I don't think all games are created equally in this regard. I swear to god, Crysis had this uber smooth motion blur that really hid the FPS drops I had on my gaming rig back in 2007. It was running 20-25 fps, but it felt more smooth than even Halo 3 did a lot of the time. I think it speaks more to the fact that games are different and depending on FoV, FPS drops and other things, in some games it mean more than others.
Overdrive looks very very good, so I remain cautiously optimistic. I hope this game will be a system seller because it looks like a fun world to explore. Fun and colourful in an almost Banjo-Kazooie-meets-Jet-Force-Gemini kind of way.