It was more like a hide behind a box and cry sequence than a boss battle. I think the boss fights were spread too thin, I thought having boss fights fairly often in MGS was nice and different, because I kept expecting lots of filler between boss fights, but like you said you barely had time to breathe between say Psycho Mantis and the first Sniper Wolf boss fight.
I would've wanted another Vamp boss fight, a fortune boss fight where you can actually defeat her, and like you said an ocelot boss fight.