I’ll throw my vote for Diablo 3. The game can be wicked addictive. I got the platinum trophy on PlayStation which was no quick feat. I just couldn’t stop playing. I would suggest choosing the Crusader to play as first. Super fun and has these flails that are specific weapons to his character. I had so much fun with the Akkhan armor set and the legendary flail called Fate of the Fell. Can take you well into the torment difficulty levels. Chef’s kiss of a game. I think people should really give it a chance if they like the Diablo style of game at all.

You should give Path Of Exile a shot. It's very much like Diablo, but it's free to play (just pay for cosmetics).

I only ever played diablo 2, but I had a lot of fun playing it!

Yeah, but they aren't fun if you run into cheaters. They're a blast if you play with some of your friends. There are other similar games too, so I recommend you give the whole genre a shot.

Having sunk tons of time into D3, I can say it's worth a look. The paragon leveling system from D3/D4 is a clever way of rewarding players who keep playing well after the main 3 (or 4 with D3 DLC) acts. I think I was at Paragon level 1100 or so when I stopped playing.

The biggest complaint people had about D3 IIRC was it's too colorful (something they poked fun at with the Whimsydale/rainbow goblin).

D2 was a favorite in college, but admittedly I never played outside of some lab parties.

D4 is shaping up to be a solid game, but this is patient gamers, so I don't know if that counts.

I wouldn't recommend going as far back as the first one. Diablo 2 Resurrected came out last year and is a good starting point for the series if you're thinking about trying it out. I never got into 3, but so far 4 feels really good.