I'm going through a bit of a F2P phase - downloading MWO, Planetside 2, Wildstar and War Thunder and this is the only game that has held my interest for more than an hour.
I've been on Warframe for over a year, but uninstalled it the other day. Everyone I knew on there isn't interrested in playing it anymore and to be honest, it got kinda boring for me too.
We're all on Warface now, Crytek's F2p game.