It is FREE. so add it to your account and try it for yourself. Worst case you waste time and bandwidth and never play it again.

Im not sure I'd say that insurgency is like classical RO. It really is it's own thing.

Maybe the PvP stuff. I only play the coop checkpoint mode. You start on one side of the map and you have to push through enemies and take objectives. When you capture an objective there is a random chance for a counter attack. Then you move onto the next objective. The maps are "open" but still fairly linear.