Well this is the first Red Faction game I have played and I must say I was pleasantly surprised and happy with what I bought.
Basically in a nutshell - if you like GTA then you will like this!
I got slightly carried away playing it and spent far too long playing it but its worked out ok as I got lots of 'salvage' which you can use to buy new items (guns, armor etc..).
There is also the many different vehicles you can drive ranging from simple cars to tanks, but probably the fav vehicle is the mechanical suit (for lack of a better word) its very similar to the vehicle Ripley uses in the Aliens film but you also get jump jets on it...... very cool!
Anyway I would recommend this game to anyone who is trying to decide what to buy, I have Infamous and I think this knocks the socks off it (and thought Infamous was good before I got this).