If it wasn't for my SO getting me the game, the expansion, and the Necromancer class "dlc" (ugh what a slap to one of my favorite classes being treated as paywall...)... I'd have not play it at all, because when I did, the launch, story, and gameplay was all terribad. The expansion is somewhat intriguing of a storyline and a beautifully fought battle with Malthael. However, it was very lacking in nature with Diablo's fight... it wasn't as beautiful as Diablo 2. The only thing that was beautified in Diablo 3's fight of Diablo was his HD red lightning attack, that settled so well with nostalgia of D2 with his fight in there. That attack alone was enough to build tears, as in "OMG THERE IT IS!!!".
For now, I am just playing it for the sake of playing with him and to build my characters portfolios. In other words, just to say "Yeah, I played it thoroughly, and it was alright. Fun to play with my SO, but not really fun to play alone.".
Other than that... D1, D2, TL1, and TL2 will forever rule my heart in this genre.