There are plenty of games besides Calladoody that are playable on both PC and console, many of them even non-competitive. I'll be especially happy to be playing Fallout 4 at 60+FPS on my PC instead of 30FPS on my PS4, and now I don't have to choose between playing it at my desk or on my couch.
That is very fun.
As for local co-op on PC, it could use some improvement, but there are already more local co-op PC games on Steam than Wii U.