My flatmate last year did marketing (although he didn't attend half the lectures), said it was alright,
as for socialising with other uni's there kind of a real derby attitude between the universities. Kind-of one-upmanships if you like (aston always wins though), in everything from Sports, right through to LGB, but yeah we do socialise.
Most students are friendly to each other, just don't sing songs criticising their uni to them, I did that to a group from UCE and they didn't take it too well (thank god we were at Birmingham Uni at that point).