I played GW1 GW2 and the Siberian DLC, overall they are super linear and pretty fun sniping games, I mean for $1 why not give them a shot? They are on par with the first 2 sniper elite games, minus the x-ray cam.
The first game is a bit visually dated fyi.
The only thread for the first 2 games is here, I think I have almost half the posts in it.