It is a really good game, very nice looking, very different for an MMO.
However, as most MMO's do, it gets repetitive, so as long as you can get around that, its a good game and worth the buy.
It has a tf2 element to it, medic class, engineer (robotics) class, heavy class (assault), spy class (recon), etc. It pretty good fun, and if you can find a good clan with some fun people in it, it can be much more fun than doing it on your own.
I play it as you can tell, but it is a work in progress and they still have updates and big changes to make, so it could get a lot better.