My brother freaking loved Diablo II and played it with me from Day 1. He did not know about the /players x command until about 8 months ago when I asked why his single player characters weren't a very high level.
It was just one line in a readme for a patch, and likely not spoken about at Blizzard since nearly every single person from DII left. On top of that Jay admitted that he enjoyed doing a little griefing which means he played online, probably exclusively.
The game looks fun, but I haven't burned myself out on Diablo clones.