Only played the first one so far. The only thing I hated is that I pretty much used the cutter 99% of the time and ammo was too scarce (on hardest difficulty). I had to pretty much have nigh perfect accuracy from start to end. I remember beating the game and the assault rifle was the only other decently upgraded weapon, which I only used if my cutter was low or out of ammo. Kinda makes a ton of weapons pointless. Upgrading should upgrade them all.
The rest of the game was top notch.
I just hope there's no fucking retarded console mouse control issues in this newer one (aka, mouse accel, dampening, etc.) that plagues every god damn new game.