I'm not completely sold on the concept yet, but then again it IS more Bioshock so I'm at least optimistic.
I will have been a gamestrata member for a year next month, and I've enjoyed every minute of it. Thanks to GS, I've made a ton of online friends and now I never lack for someone to play with. Of course, the actual website is addictive as well. Wether I'm answering questions or posting in the forums, there's always something to keep me busy. If it weren't for GS, work might have driven me insane long ago.
Trust me on this. I met such great people to play with there that one year later I'm STILL playing with 'em.