We chat about videogames and videogame accessories.

Eh, the four-digit number isn't displayed anywhere outside your profile. It's basically just a way to make sure that people who want to add you as a friend are actually adding you, whether the name you've picked is popular or unused.

As for the quality of Diablo III, I can't really think of anything pertinent to say, other than that it got repetitive pretty fast for me (though I'm hoping Adventure Mode does something about that), and that if you're going into it expecting Diablo 2, only better, you'd be better off playing Path of Exile.