Killzone 2, PS3, First Impressions

So I've spent the first two or three levels shooting my way through war torn Helghan against what sound like clones of Jason Statham wearing the most badly designed military uniform ever conceived.
In that time I've come to the conclusion that they should have called this game 'Gears of Duty: Fall of Halo' because if you squint, it's not hard to imagine you're playing any other FPS blockbuster of this generation.
That's not to say it's bad, but I haven't been able to escape the feeling that I've seen it all before...