Odhanan
Adventurer
What is it that motivates you to join a campaign? Is the options the DM allows you in character building (e.g. getting to play that crusader you've wanted)? Is it the campaign setting? Is it the style of the campaign (e.g. dungeonpunk, horror, or swashbuckling)?
All these things matter to me, but most importantly that's the people around the table themselves that will make me want to play or not play. If they're friends, if I like their personalities... first and foremost, I have to get along with the people I play with. If I get along, all the other components will fall into place.