I just don't necessarally think it is a bad thing for a new group to know how a new player is used to playing and vise versa. I know I'd rather know about potential conflicts in play style and rectify those issues before play rather than during. Now, if someone insists on not compromising or entering into the social contract, well...there is issue.
Heck, I've ran into it with freinds I've known. The main DM is rather open to adding stuff, but I was starting a Pathfinder campaign. A player started trying to pull things from the 3.5 draconomicon (which none of us even owned, and what he was wanting to pull in he screwed up the rules for anyways), and it took a couple of times of telling him "Dude, Pathfinder only" before he got it into his head. Ironically, I probably would have said yes if he had asked about it, but he didn't. Other people are stricter DMs than I am, and that's fine.
But we're pretty much agreeing on the main point: Don't be a jerk.