SP rocks enough for the price of the ticket.

I think MP needs more maps, and styles.
I would love to see a defend vs horde without numbers map.
Also a persistent version of MP based on the SP campaign could be pure gold (particularly if they took a look at Necromunda and used the experience system from that... ie an Uber army fighting noob would get a win + minimal xp, the nood would probably loose but get an xp bonus).