And The Winter Soldier was really not that funny, at least compared to most other MCU films. But they'll get some practice in sci-fi and such with Civil War, so that should help warming up for the even bigger war. Still, I would rather they branch out a bit with directors and not just use the same ones over and over, even if they did a good job the first time (Jon Favreau between the first and second Iron Man films, and all) and give them a chance to make other films in between to build up their experience more before coming back. Joss Whedon was able to do other stuff between the first and second Avengers so that was good (not that I don't have faith in him to make anything great) but pulling in the Russos to immediately follow TWS with CW and then two more films in the same line on top of that, I wouldn't think would be a good move logistically, without any personal feelings about any particular directors. Even Joss Whedon would need a decent hiatus from that, and it looks like he's just doing that on a more indefinite basis.