one of the 1st PC games I ever got,great experience & something all rpg fans should play, diablo started it all I think.
Diablo was one of great games in its day and may represent the pinacle of isomorphic action RPGs. It is simple to learn (a 4-year old can play it), a has a random level generator that keeps the game a challenge for a while.
Diablo's network play was one of the first games that I found to work well, even on a modem. There were occasional clipping problems but nothing to severe.
The game keep you interested way beyond what was reasonable because of it being a collector game (try to find the best equipment.)
The biggest draw-back of the game was the limited number of monsters and levels and the huge number of cheats and hacks that ultimately spoiled online play.