Ok lets just wrap up this thread.
1)Unreal Tounements have such a lame story and focused too much on multiplayer that i didnt really deem them as good as the like of the COD's and Half Lifes which have great story and mulitiplayer (if counting TF2 and half life teamdeathmatch on pc for half life)
2)Quake is great and yes i agree i should of put that on the poll
3)Timesplitters is also a classic and if the space permitted it would have been on their, in my opinion its flame tag/infection is probably the funnest game mode to play with friends.
4)All soldier of fortunes are inferior in nearly everyway to any of the series on the poll.
5)Yes Duke Nukem isnt really a series but its up their because it is a classic, and has very similar gameplay as Doom which has a formula for fun
6)Never played No One Lives Foever so i cant really comment on that.
7)Gears isnt an FPS.
8) Although not a series as such, GoldenEye on the N64 is the benchmark of quality and in many peoples opinions is the best FPS of all time.
and finally to sum up, as different people prefer gameplay and mutiplayer over story or graphics over cool new modes or features, it is really hard to suggest one that ticks all the boxes. Im not a Valve fan boy, but The Orange Box has all the FPS action ud ever want, with the compelling story of Half Life, crazy fun multiplayer of TF2 and although not technically a shooter as such, Portal for its mind blowing puzzles.
Nuff said.