Uverse offers a host of multiview channels (news, sports, kids, etc.), and it gives you the option to customize one yourself. Unlike the multiview they show in the Sox games, those aren't different views of the same show, it's really just a glorified picture-in-picture over several channels.
As a Uverse subscriber, I can count on one hand the number of minutes I've ever spent on these channels. Even on a large HDTV, everything's too small to see what's going on.
I do wish they'd stop it in the Sox games, regardless. Most in-game advertising is benign and unobtrusive enough that it doesn't detract from the game; that's not the case in this situation.