I've never played any of the Diablos, or met anyone who has. But they are obviously popular for a reason. Are they worth going back to the first one?
Edit: Thanks for the answers, the community is alive! Based on you recommendations it looks like I'm going to give 2 resurrected a try.
You have to remember that this game came out a long time ago, it had many features at the time that set it above other games.
It had a good storyline, multiplayer, maps that would change every time you logged in (multiplayer), the ability to be powerful after spending a lot of time in the game (and if you saw anyone with a rare/cool looking armor you know they worked for it, there were no lootbox mechanics where you could just pay money for it). And of course… there is no cow level ;) The skill tree allowed for tons of different abilities and combos, or you could grind away at a single skill and become godly with it.
You may not recognize the appeal to the game now just because so many of the mechanics have been copied and implemented in countless other games since then.