The best shooters are on the PC.
F.E.A.R scored review scores in the low 90's.
Kill Zone on PS2 scored average review scores in the low 70's.
I expect Kill Zone 2 and FEAR 2 will both have average review scores in the mid 80's. Far Cry 2 last year received average review scores in the mid 80's. I expect Kill Zone 2 and FEAR 2 will be close to Far Cry 2's scores.
In regards to buying these games I will pass on them.
F.E.A.R. 2 should be a step down from F.E.A.R.
Kill Zone 2 will be a huge improvement upon the mediocre original Kill Zone on PS2. Even if Kill Zone 2 scored low 90's and became AAA title I still would not buy it because a PS3 is not worth buying just for a few exclusive games.