Everyone and their grandma had a more powerfull than 800x600 system back then.
edit: Oh yea, 640x480... I HATED DIablo 2 because of that. I had expected DIablo 1 looking Better, but when it came out, it looked worse. Hated Hated Hated. Coupled with Battle.net being down. Spend a lot of time hacking characters/savegame and then left the game. :\ (and when I wanted to replay it, someone had stolen my cd's.. doh)..
Worst game purchase ever. :)