MMO, but I got this feeling that it will be free to download by Sept.
Try out the trial but based on my opinion if your looking an MMO to try look at never winter its a fun lvling experience especially with a friend and its free to play. Rift is also free now I never played it but heard it was an ok MMO.
Defiance is not really a true MMO its more a third person shooter with MMO elements, the gameplay is really repetitive and though I haven't played long enough to see it because I got bored from what I heard is there is no real end game to it.
You can try the trial though for free that be your best bet. Don't rush yourself this price point will be back, usually during steam sales they all come back before the sale ends.