Patrick87: I disagree with Hovercards being useful only for articles, as the casual viewer would rarely - if ever - see a User link unless they were on a Talk page for some reason. It's an editor feature, and only editors will realistically ever encounter it. I also don't think it'd be particularly difficult to avoid hovering over user names.
At the same time, your concern with the User cards brings up a good point, and I think I'd agree with your point about the triviality of the edit count. Someone with 100 edits may have written 10 whole articles with just those edits, whereas someone with 1000 may have just done a lot of minor copyediting. There's no reason to compare the edit counts as though they matter, and they really only help sustain the "I have more edits, therefore my opinion is worth more" culture of Wikipedia.
I would prefer if a user was able to set a custom message in their User card, perhaps via Preferences?