See, I was going to make the same point Fortyseven made earlier, about it being an online console thing (communities don't seem nearly as strong as they do on PC, and local multiplayer is always better on console), but you said you've also had problems having decent local sessions too, so I'm not sure. To be honest, me and my friends still play games together fairly substantially. There's an Xbox at uni that must be wearing holes into the Pro Evo 5 disc by now, and when we'd probably play more games if we could be bothered to trawl the second hand shelves for another decent game. We've got a Wii in there now, and I'm actually concerned about getting Brawl, because we may well never get any work done if I do!
Perhaps it's simply a case that there actually haven't been any decent local multiplayer games yet this generation? I mean, most of the 360's good multiplayer games are designed for internet play, and larger numbers. Four player Halo 3, for example, just doesn't work as well on the massive maps. And with the Wii, I expected it to continue on from the Gamecube and bring out tons of good four-player fun, and yet, before Brawl, all we've really had has been Sports, and that's too limited to make a sustained game out of. Both Warioware and Mario Party have been rubbish this generation.