Cool story, awesome spell and skill set, a wide array of weapons and armour, damn awesome bosses, this is the essence of Diablo II. Though many now may find it a simple hack and slash game, many more will remember it has a deep and rewarding experience.
This is no Titan Quest or Sacred, this is the original which is, much better than those knock offs. =P It has a far more rewarding story, a far grander range of items you'll find and a much deeper and expanding RPG experience. You'll fight hundreds of different enemies, epic and punishing boss fights with Diablo himself at the end!
The multiplayer is brilliant as usual with the good old 8 player co-op. You'll find plenty of friendly players and thousands of games ready to invite you into the experience. 8 player pvp is also awesome. xD
Haven't experienced Diablo II yet? There's still plenty of time to!