I have been playing it a lot. Contrary to many, I really enjoyed hellgate:london. Of course, I never made the mistake of subscribing.
I have duke nukem forever and the witcher 2 both recent purchases on my computer. Alas, I have been spending far more time playing Hellgate Global.
I have never had any waits to play the game. They have added new content beyond what was available before. However, I have yet to be of a level to see it.
Know that it is only free through act 2. To enter act 3 and complete all of the remaining content it costs only $4 per account.