I play on a 56k everyday on steam. I dled steam with my 56k (first time corrupt) never say a fricken 56ker cant play on steam or dl it. Cuz i have. thats offensive to me, and dont blame my ass for not having cable\dsl. Blame the companies ass cuz they arnt around where I live. :|.
So all in all, i do good in cs (usually ) and im on a 56k and i had to dl steam twice on my 56k. If i had to dl steam twice then i think i should be able to play. Although i do use lan so if someone else does something ill lag like a hoe > But then i just kick that persons ass.