After playing it for awhile, I've found it can be both very boring and pretty fun at the same time.
I got the engineering certification and was flying around with some guy on bombing runs. That was some fun, for sure. It's kind of pathetic, though, how the fiirst thing you see upon spawning in your sanctuary is a monitor on the wall playing Axe body spray commercials. -_-
I'm on a relatively fast connection with a computer well exceeding the recommend requirements, and I experience some serious lag and chop upon entering congested areas. It sucks when you're flying overhead an enemy encampment, then your display freezes, you hear an explosion, and three seconds later you see your pile of wreckage on the ground.
All in all, it's a pretty fun game. I'll probably be playing it a bit more, atleast until I get up until the limit of Battle Rank 6. For free, it's worth it. For a monthly fee, it's not.