omg I just got the particle gun. Talk about taking pleasure in offing evil nazis. You'd think that this is a new concept that noone ever did before. I love the weapon upgrades and that kar98k...BEST implementation of that gun EVER saw in a shooter. The feel, sound. Just plain awesome.
The only thing is that the hit detection is a bit spotty at times. Bullets sometimes seem to hit invisible barriers (not the shields of the shielded soldiers) but with the normal ones. Apart from that, enjoyable game so far.