I normally avoid multiplayer games as well, but I "had to" participate in the test fires because I was still on the fence whether I was interested in the game or not and wasn't going to buy the game without testing it out. I wanted to support Nintendo for taking a risk with new IP instead of turning it into Mario spin-off, but nothing I had seen had really excited me. But I ended really enjoying it even with randoms. It has a single player, but for once I think I might actually play quite a bit online. Only games I've really put time into MP has been Dark Souls (co-op, not pvp) and Mass Effect 3.
Yeah, it was pretty lame. They probably thought that regular would need a "hook" more than XL which a lot of people seem to go for nowadays. I got two sets of faceplates besides the regular black ones. One has Boos that shine in dark and other one is wooden Mario faceplate.