Wow, I used to play this game a LOT when it came out. I never got the sequel though, even though I liked the demo. I don't know why.
I used to play campaign co-op over and over again with a group of guys named the "beer drinkers united" or "beer guzzlers" or something. The leader guy was a jerk, but they were fun to play with and most importantly, someone was always on.
I loved planning before a mission, saying stuff like "uh we need two AT rockets for this one, maybe we could have 3 in case the first guy misses one of the first two tanks" then the third guy designated to carry the third AT rocket would say "i'm already maxed out with this machine gun, either I take a pea shooter and maybe use it or take the rocket and watch the real rocket guys get killed so yeah" and then we would say "the 4th guy will cover us" and he'd say "but he only has a sniper...
Yeah. I think I still have my disc around here. I'd love to play with you guys sometime.