I could definately see that. It takes getting used to, but it's when you play with people you know (like I used to play with Sully, ZXLT, and Jets). The online co-op was a blast too, I used to play that with my buddy, we actually finished all the co-op missions.
I tried out COD2 online 3 times or so, and I didn't have fun, because I had no idea who I was playing. Only time playing with random people is fun is Halo or Rainbow Six, but only when you have a group of people you in the room as well.