TL2 and Diablo 3 both can scratch the hack&slash itch in their own way, although they both have downsides as well. Both tend to fall down in the end-game, although you can still get a good 40 hours out of each before things start to wear thin. I also found the gearing in D3 to be a bit lack-luster, due to the limited pool of relevant stats and even among uniques only a very small number of items that stand out enough in changing certain mechanics to be considered build-enabling (and even with these the effects were fairly minor).
I'd personally recommend
Path of Exile, although be warned it caters to a pretty hard-core fan base (best thing to do is check out the
skill tree- it will either draw you in or send you running). Also, since the game is free to play (and no pay-to-win elements), if you don't like it then you're only out the time it took to download it.
Titan Quest, mentioned earlier in the thread, is another good choice. The character system makes for quite a bit of build diversity, although since the world itself is static sequential playthroughs can become stale quickly.
Divine Divinity, also mentioned in the thread, is a fine choice as well. The hack&slash action is quite a bit more shallow than the other games mentioned, although it makes up for this in greater depth of the game-world (more a traditional RPG with Diablo-like gameplay, rather than a straight up aRPG like the other games being mentioned here).