I work at a game company, and the majority of what's in version control is either binary or (effectively) unmergable. I know this is relatively unusual when it comes to software development, but this fact alone gives me a lot of pause when thinking about whether something like Git would be a good idea compared to SVN, Perforce, etc -- discovering conflicts immediately is vital in this sort of scenario. Mentions of things like six-second merges makes me believe they can't possibly be testing with a repository of any significant size (tens of gigs, at least). How well does something like git handle this scenario?

Not to mention P4 absolutely trusts the server as to the state of your local repository. Get a few files overwritten locally somehow and good luck figuring out what's wrong when something starts acting weird a month down the road.