I've played it for a very long time, since 2011, and while there have been spurts where it was the primary game I played, I don't think I could have ever classified it as my favorite game. It's great an all, but I'm just so prone to getting burnt out.
Also, the game was never great for party play, trying to reroll map mods for multiple builds was a pain, the rewards didn't scale with the difficulty increase, it just felt awkward to me, not like D2's system.