I've actually been spending most of my time on the campaigns, playing at least casually (I don't have a lot of time these days.) I just got to Campaign 5 and it's been a lot of fun throughout, very strategic and it's a different feel than your typical shmup.
That said, your continued enjoyment is probably going to be dependent on how active the community is, and how much you dig the whole sticky-ship mechanic. If you want to give it a spin, grab
TUMIKI Fighters and try it out. I do prefer BlastWorks to TUMIKI, I should note, though; the smaller size of everything (more manuevering room, etc) plus the analog stick make it feel a lot less experimental and more winnable.