I was intent on not buying this when it comes out because I dislike the strict, always online connection and that there will be no modding. Some of the best mods I have ever played were in D2 and that made the game fun for hours and hours. Unfortunately, I don't think I will play D3 as much as I did D2. The quirky server issues and lag were bad too but I have faith that it will get better.
However, I will most likely buy this because, yes, it is Diablo and some of the most fun I had in college was staying up late and playing with a guy on the other side of the country for hours and hours. I still remember the original Demo in PC Gamer and how I kept replaying it over and over again.
Of course, my wife doesn't understand my gaming habits, but now that my older son is getting to the point we can do co-op, I think this will be a lot of fun too.