The sequels were definitely not so good. Although I really liked the TV series. I watched and enjoyed all of those.
I like hack and slash games, and enjoyed Diablo, but just couldn't play it for long periods of time before it got too repetitive. For another hack and slash game I enjoyed more, Dungeon Siege was a favourite of mine. It felt more like a proper RPG, with a full party of adventurers to command, and a nice battle system where you could pause the action to issue commands, and then unpause to see them played out.
But for one of the best hack and slash style games, Icewind Dale has to be one of the best. A game system similar to Baldur's Gate, but with a combat system closer to hack and slash.
As for Blade Runner. I also think it is slightly over rated. There is so much more they could have done with the concept, but it is still great all the same.