Warframe is one of the best games currently in the market period! better than most games you pay $50+ for, it maybe in open beta right now, but the way DE and the DEV's are handling the feedback is beyond compare, all developers need to take a look and learn from the warframe team, it is evolving into something very special, and it is free to play!!!
so unless your a game snob that likes to feel special paying for games of half the quality of warframe then you have nothing to lose. as a founding member and a member of the design council (yes that is how seriously they take user involvment) i can say there are some very cool things coming E3 being the next big thing.
dont be left out and dont miss out on somthing thats free, graphics alone outdo many of the paid games! (and its still in open beta)................Nuff said i think!! 5 big bold and very shiny stars for DE the DEV's and the game itself!