Call of Duty 4 
Halo Overall Comparison This will be a quicky because I saw it in the justifications list... and I'm tired.
Halo was pretty great, Fresh new game back in that day. looking back Halo is still among one of my favorite. and probably will remain so, first person shooters.
Call of duty 4 is what... a year old now? a little more? It's played second most on the xfire community. but it is the number one most played first person shooter on the xfire community. of course followed by call of duty 2. Call of duty 4 brought almost exactly what everybody wanted in a fps I would say, war, but at a here-and-now scenario with customizable weapons out the butt...
Halo at the time was just classic single-player, co-op, and multi-player ( now known as split-screen on most games), LAN was a big deal too. 16 vs 16 was nice. weapons were nice. and strategies were created. terrain was simple. blood gulch probably being the most fun/simplistic map ive ever layed eyes on. 2 bases, 1 canyon.
Call of duty 4's terrain is destructable. shooting through walls is a great advantage. and since all the maps are more "maze" like. you have to realy be on your toes sometimes. another great feature of both games but i think is more enhanced in cod4 is the motion tracker. normaly in mutliplayer on cod4 you earn this by killing a certain number of people in a row. and then the effects last for only a few seconds. halo has a longer one but it wasnt as fun knowing where everyone was.
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Comments
Also, I like bullet weapons in games.
Halo is a classic. In fact, it's still just plain awesome. (The shields are fine; I don't know what your problem is.)
This comparison should never have been made.