I played in the beta. I've always had a mediocre opinion of those type of games...never really got into halo for example, unless I was hanging out with a friend who liked it.
Starhawk on the other hand had me up many late nights cutting into my sleep lol. The progression on it is fun, lots of different "styles" of play you can take on legitimately without being outplayed by some other cookie cutter style. I personally loved rushing to the enemy weapon supply building, and shanking anybody unfortunate enough to walk in. Id get a lot of kills, then they'd get pissed off and blow it up leaving me vulnerable lol.
Fun fun fun.