Well I'm a bit confused on acouple titles on the list. Mainly I though Light Gun titles (or traditional shooters) were in a different genre.
I agree that Half Life is unquestionably number 1.
For number 2 I am tempted to say Quake. I am trying to remember which was the First FPS engine that supported Y-axis control, can anyone help me with that. I kinda thought that was the difference between Quake and DOOM, but I could be wrong. This to me, was a difining point in the genre's evolution that was absolutely essential.
3rd: Wolfenstein 3D, No question. It was pitifully simple, and pitifully enthrawling. It started the genre and it was brilliant.
For me the rest was really a toss-up, which I don't think can really be settled because everyone has there preferences and endless Keyboard and mouse 4-ever vs. Whatever I like to be able to sit with my friends and not have lag f*** noobs over vs. I started gaming with Halo!
Honorable mentions from me go as follows: DOOM2: Boosted the genre wether or not people feel it did or didnt deliver, It made FPS here to stay. Goldeneye 007: Solid game, fully fleshed out, and the deep multiplayer added an element that pulse-dial games of the past (which did come first) ultimatly didn't have. Medal of Honor: I don't think I need to explain, very hard work by those folks. Last and most certainly not least (please no tomatoes) Turok:Dinosaur Hunter. I don't knoe who of yu guys remember its debut but I sure as hell do and it was impressive to say the least. The number one thing I believe it deserves credit for is controls. Absolutely fluid and orgasmic. Amazing design and a small amount of interactivity with surroundings. It was a much better 1 player game in comparison to Goldeneye. but obviously no multiplayer which I believe kept it from Game of the Year. Forget 2,3,RW and skip to Evolution, which sucked, but my god NICE TRY. If only they had made it a good game. It to this day has the best enemy AI I have ever dealt with. Halo 3 did impress me but it wasn't TE. You actually had to figure out what to do against them and trick them with grenades and shit. Problem was the wanted it to be star wars or DIno Crises meets Duke Nukem! or I don't knoe what the hell they were thinking....probably we are gonna lose our jobs so, lets just collect our last paycheck... yeah.. please comment... sorry for making yu read this much.
"Let justice be done though the heavens fall." - Jim Garrison
"Ask not your horse, if ye should ride into battle" - myself