My issue with D1 other than the lack of story was definitely the expansions. They were priced almost as a full game each one, and eventually all came out as one giant pack for just $40. I felt my money wasn't well spent when I knew down the line I could easily get them all in one for cheaper than say, even the first pack.
I know thats the road with all games, and you have to value the game and that the expansion will add more to the game, but I felt as if the game was abandoned until expansions had to come along and fix it..
I definitely treated the game as an FPS/RPG where I was more invested in the story and learning about the world (When D1 was being hyped/before it came out they definitely hyped up the world/events/story line and was severely disappointed when it finally came out that it was all scrapped..). I wouldn't really treat it as PvP, as I'm never really interested in that in MMOs, I'm always pro-PvE.
Still, scared about dropping $60 on it just to become a bust.