I think the biggest disadvantage is that you have to emulate a virtual desktop with the same size as you play in and if you change the resolution in-game from that, it does not look good. I do not remember if the videos behave like this in Windows though. If I resize the screen it shows correctly.
I tried it out in my installation of Warcraft III (not using the lutris installer) and it now plays the videos although instead of scaling to my screen resolution (1280x1024), they play in a 800圆00 window in the upperleft of the screen.
As I understand the workaround, you use winecfg to set the following
