Titan Quest (Windows)
Think Diablo, but using greek mythology as a backdrop, you get Titan Quest. With its dark atmosphere that brings me back to my Diablo II days. :D
Torchlight II (Windows)
From the same team who made Diablo I & II, it plays just like Diablo of old, and works wonderfully. If you are gonna play the game using Steam, may I suggest you get the "Torchlight II Essentials" mod, as it basically adds a new class, and tons of improvement from the vanilla game (respec, tons of new pets, items, etc)
Dungeon Siege III (PS3/Xbox 360)
Developed by the same team who made the PC version of Neverwinter Nights 2, its a decent enough hack-and-slash game for the console space. The fact that finding a brand new copy of this game nowadays is relatively cheap, I'd say why not?
Dungeon Hunter: Alliance (PS3/Xbox 360)
Do you like to play hack-and-slash games but you don't want to spend too much? You okay with digital downloads? Does $12.99 (roughly Php 600.00) sound good to you? Then get this hack-and-slash gem from Gameloft. It's a pretty barebones hack-and-slash game, but hey at least you got it cheap.
Diablo III (PS3/Xbox 360)
Do I really need to say any further? Critics have been calling it the best version of Diablo III, and rightfully so. Offline play, amazing loot, local co-op, and so much more, its definitely THE version of Diablo III to pick up. If you want to find out why the console version is considered by many to be the better version against the PC version, you might want to read this post I made comparing the 2 versions.
Heroes of Ruin (Nintendo 3DS)
If you own a Nintendo 3DS, and you are craving for some on-the-go Diablo-style gameplay, then look no further and take Heroes of Ruin for a spin. It's basically a stripped down version of Diablo, but it still nails the simple and addicting hack-and-slash gameplay of Diablo perfectly, which is what's important. It's got local co-op as well as online co-op, with daily quests and other features that makes it a decent enough game for those looking for hack-and-slash gaming on their portable. Now that it just recently got a price drop, its definitely something to consider picking up.
Dungeon Hunter: Alliance (Playstation Vita)
Yes, its the same game for the PS3, but unlike its cheaper console counterpart, this one charges a full price for the experience. As much as I don't like recommending this game really for PS Vita owners (coz the price is just extortion), there's little hack-and-slash games out there that I can recommend (considering the once promising Ruin was cancelled) as of this writing so yeah...
So what do you guys think? Do you have any other suggested offline Diablo-like games to share? Sound off on the comments below! :)