Here are mine, IN NO PARTICULAR ORDER.  I'm specifically talking campaign mode for single or co-op and not online multiplayer.  Feel free to add in a couple.   A few of these, like Mass Effect, aren't straight up shooters and maybe shouldn't be on the list, but put them there anyway since they are most shooting...

1 Call of Duty 4
2 Gears of War
3 Gears of War II
4 Killzone 2
5 Halo 3
6 Bioshock
7 Resistance II
8 Far Cry 2
9 Resident Evil 4 Wii - yeah, I know it's a stretch to call it a TPS.
10 Call of Duty, World At War
11 Mass Effect
12 Orange Box
13 GRAW
14 GRAW 2
15 um....

Mine would be most of that list, minus Killzone 2 and GRAW 1+2 (edit: and CoD:WaW) since I haven't played any of those yet.

I'd add Fallout 3. It's pretty much a shooter.

I haven't tried Fallout 3... I still need to take that one for a test drive...

Resistance 2 campaign should be lower on your list and the first one needs to be on it

Gears 2 shud be on top of gears 1( campaign is better on 2) and just IMO I think Bioshock shud be on top of halo3...rest is fine KZ2 can go higher than gears 1 or stay on same spot.

1. cod 4
2. bioshock
3. resistance 1
4. killzone 2
5. resistance 2
6. halo 3
7. humm i dun think ive like any other fps's so far. well i liked cod 5 but the campagin was gawd aweful

(yes i did not like far cary 2 and fallout.. fallout would have been fun if it were earsier to kill some1 then run away right away, and if the health packs did more.)

Here are my top 15, in order.

1. Killzone 2
2. Metal Gear Solid 4
3. Gears of War
4. Resistance:FOM
5. Gears of War 2
6. Call of Duty 4:Modern Warfare
7. Dead Space
8. Bioshock
9. Fallout 3
10. Rainbow 6 Vegas 2
11. Ghost Recon Advanced Warfighter 2
12. Call of Duty: World at War
13. F.E.A.R.
14. Rainbow 6 Vegas
15. Timeshift

15 is a lot to me although I'm a shooter fan but I'm gonna give you just 5

1- Bioshock
2- Dead Space
3- Resistance 2
4- Resistance 1
5- Battlefield Bad Company


Gears 2, COD4/WAW and Left 4 Dead (because no online) didn't make it

Thanks for reminding me that I haven't played a GRAW game in ages and would appreciate it if Ubisoft would get off their ass and give me a new game. Oh, and give me a new SC game in the vein of 1 or 3 while they're at it.