Pure fantasy fuel
In regard to accurate depiction of space combat, well... it's not (space fighters ! stealth !) although not totally bad. But let's be honest, the comic's attraction comes from, well, the attractive protagonists, who are indeed all females, and pretty. And shower often. They must smell good too.
Ad there's the what-if factor of "wow, if ROB or ASB dropped me into this universe, I'd be the only guy in a solar system full of lonely women ! Yay !".
In conclusion, Angels 2200 is a very pleasant read. Apparently, the next update is due in january 2010 though... yeah. Long wait.