Because every fanbase has shitty people that give their overlord company a free pass for everything.
Sony: Oh it's alright that Sonys first party has a shitty output to date, we will get "insert most likely pretty mediocre niche japanese or indie games that everyone is totally interested in" instead.
MS: Oh it's fine that MS leaves us in the rain for 3/4 of the year (though if rumors are true they might have a july game for the US), they will have awesome holiday games most of which we won't buy anyway but hey Halo amirite? Oh and this year they paid for a game that was already in development for every platform to be delayed for the other platforms so it would give them another "exclusive", but wait it might, maybe, totally not come to PS4 next year, so that's really awesome.
Nintendo: I love that the Wii U doesn't have any 3rd party support, it shows that Nintendo is really sticking it to these horrible anti consumer companies. There's only a handful of games coming out on the system every year? Oh that is totally fine, man those games are so awesome that they are totally worth enduring several month long droughts for. Oh and don't even get me started on how awesome Amiibos and the practices behind them are.