I wouldn't say split screen performance is killer, either. I don't think it's reasonable to expect all of the games in this collection to run perfectly well in split screen.
lolwat?
If you're going to include an option - and advertise it as a feature - you make sure it works. Outside of matchmaking, split screen has the most issues, and most glaring performance problems and glitches and bugs.
I've said this a bunch of times, but look at how Nintendo handles their ports and remasters. There is zero possibility they would ship a game in this condition. This is the company that has spend more time on the 3DS port of Marjora's Mask then they spent making the original N64 game.
MS released MCC 3-6 months too soon to try and win BF and the all important holiday period. That's the reason the collection is so flawed.