While I'm not sure I agree with his assessment of Fighting Games or his understanding of the reason Nintendo cranks up the Fan Service and pumps out more Smash, as an avid fanboy of Nintendo and someone who enjoys Multiplayer games and Fighting Games...
I actually 100% agree that he shouldn't at all review Super Smash Bros WiiU/3DS. A naive me liked the idea of him reviewing each New Mario Platformer on the condition that each one does something new, and the latest ones have been doing so, even if in a formulaic way. The addition of multiplayer, the increased dimensions, the new power ups and characters not normally used in the platformer, the increased difficulty and environments; to an outsider Nintendo is doing nothing but changing the title and box-art and reshipping the same game, but to anyone who tries, each game is actually radically different.
However, beyond the upgrade of the graphics, the addition of some more new characters and stages, and a few new gimics here and there (and while this may sound similar to the above, it's by a completely different scale), the Newest Smash is basically the same tried and true formula. They release a new one for each console cycle because of the upgrades in tech, because the people involved enjoyed toying with it, and because the fanbase of both Fighting Gamers and Nintendo Gamers both eat it like catnip. But while I could ask Yahtzee to try the Mario Platformers because upon trying those genuinely are different games, his review of Smash Bros WiiU would be pretty much just like his review of Brawl (even if I HEAVILY disagree with said review).
His point on the lack of story is 100% true, and I'm not going to judge him on that. If he doesn't like multiplayer, I feel kinda bad for him, if only because I absolutely love it, but I'm not going to judge him on that, either. I think his creed on Fighting Games couldn't be any more wrong, but I'm not going to lose sleep on it. And I'm willing to buy "Nintendo being on the box" isn't an auto-win; quite frankly it shouldn't be.
So what possible reason could he have to even play the game, let alone review it? I'm sorry, but Pac-Man and Mega Man aren't enough on their own to sell it when the other 99% of the game is just something he won't enjoy before even turning on the system. Quite frankly, I'm more curious at who is still bothering him about it. Any chance we could get another Mailroom Throwdown?