We haven't had many memorable boss fights this generation, what a shame.
I can tell you haven't played anything in the Souls series.
I didn't say that we haven't had any. I just said that we haven't had many.
God of War 3 didn't do it for you? Every boss in Bayonetta? Space Buddah guy in Asura's Wrath? Laughing Octopus from Metal Gear Solid 4? Or the final fight with Liquid for that matter? The crazy doctor from Heavy Rain (a bit of a stretch I grant you that, but unforgettable all the same), sending Wheatley to the fucking moon in Portal 2? Need I go on?
I burned out on God of War a while ago so I haven't played that, I have no interest in the Quicktime-y Asura's Wrath or Heavy Rain, and I don't want to watch the overwritten MGS cutscenes. I simply haven't played Bayonetta.
Portal 2 was awesome, though!
Still, it seems like last generation had big boss fights as a standard. It was a game's real send-off, a good finale, and that doesn't seem as common these days. I don't think every game needs one, but I'd like to see more of them, and more creative ones too.