Killzone 2 is a great looking game & will be one of the best of it's type but in terms of gameplay is relatively simple button pressing that allows you to kill people & blow things up. & that's it.
The FPS genre is generally aimed at kids/teenagers.
Mass Effect (Action RPG) is for the more advanced gameplayer where you still get fast & furious action but you also get a whole lot more for your money ie.. make important multi-directional choices, grow your character, a decent story with twists to unravel etc. Crucially all great RPG's feature vast open worlds where exporation & discovery is far more satisfying than being pushed down the linier levels & missions of First Person Shooters.
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