CoD2's online isnt as bad as some will say, just like any other online game, you get laggy games but nowhere near as bad as people make it seem. i wasnt expecting much from the online but it is really fun, balanced, and addicting. even though the options are minimal the game modes are plenty and everything is great fun even with the 8 player limit. as for the single player, there isnt much more to be said that hasnt already, its THE best WWII shooter i have every played and one of the best FPSs i have played. the AI is great and impressive, the graphics are awe-inspiring, and the gameplay is intense and great challenging fun.
Quake 4 on the other hand is also great. havent played as much Q4 as i have CoD2 but what i have played the single player is fun and gives a good creapy tempo. the story is said to be actually pretty good, the AI for the most part is usual run at you shooting and clawing except for your teammates who show some pretty good AI, the graphics are the Doom 3 engine pushed pretty good with all the snazzy effects that the engine supports looking good. If you like past quakes and Dooms you will feel right at home with this game. as for the multiplayer, i havent played that at all but from what i have seen and read its mostly a updated port of Quake 3 arena.
as for PDZ, i wasnt even a fan of the original (felt it was held back by the N64's lack of power) but i enjoyed PDZ. for a xbox port the graphics keep up pretty good for a next gen title, i can see how people say too much of the game looks "shiny" but other then that its pretty good looking. character models may leave something to be desired sometimes but i think that has more to do with the art style and not a technical set back (character are composed of around 8k polys like the models in condemned) but in the end it should be remembered that this game isnt trying to be super realistic. the controls take a little time to come to grips with, the AI is nothing special what-so-ever, and the story can range from hokey to just OK. all of this is expected because the game isnt trying to be anything other then a good shooter which IMO it is. as for multiplayer, i dont know how some people were confused. yes with some modes it wasnt clear to me but all i had to do was ask someone in any game and they could tell me. mostly played TD and it was a blast. the levels were huge, the lag was kept to a minimum to non-existant, the weapons were balanced, and the action was fierce and fun.
hope any of this multi-game rant helps.
my order is as fallows for many reasons:
1. CoD2
2. TIE: Q4 and PDZ.
on a side note, if your into FPS, i would check out condemned. its gorgeous, fun, scary as hell, and a new take on FPS. i would put it up there as one of the best launch titles for sure with CoD2 and PGR3.