The first couple release of Mission Control were total ass, the window grouping pissed me off to absolutely no end. I don't know when they fixed it since I missed Yosemite and El Capitan, but they finally brought back the old-style expose layout for windows at the very least which makes me much happier.

Now if only they would put full screen on a separate button again, I HATE that the zoom button was been hijacked and I have to hold down option just to zoom a window. Why can I not change the default behavior? That would be a nice compromise at least.