1. which game do you think is better (multi-/singleplayer)
because you get updates in multiplayer, you dont in singleplayer.
and u get to fight other people from around the world.
3. what is the best and worst thing about BOTH.
best thing about mw2 is the umm perks, that for most perks theres an opissite perk to it, like ninja and sitrep.
worst thing about mw2 is the amount of boosters, rank hacks.
best thing in cod 4 is hardly any camping, maps are perfect, more than one bolt action rifle. rarely hitmarkers on sniper weps.