To honest, I only downloaded this game because I just saw it on the free to play section of the PS store. My first reaction was that this is going to be a crap game, I was wrong. Its a good game to just play when your in relax mode. Your able to solo most of the missions. My favorite missions are the small ones where you save some of the soldiers, these type of missions are pretty much all over the map. The story mission are pretty good but require a small group to get it done effectively and quickly. Its possible to solo it, but you need to get the gear and upgrade your weapons to get it done.
To me this game is pretty good, I'm currently lvl 8 and plan to play this some more to see how the story pans out. I'm a sucker for story and this game has a pretty good one so far.
My video is at DLive