Played WoW, Diablo 3, and Heroes of the Storm. Low settings with high res character models turned on and anti aliasing on low on WoW. Got 60 fps on wow like that, 90 without AA. Not ideal being on low but fine for a random match or dungeon on the go. Didn't expect it to play anything as it's not what I bought it for, but fun to know it does in a pinch.
I don't know how to play HotS, but I downloaded it and played through all the tutorial missions and tested out several heroes. Played for over an hour. No stuttering or issues that I ran into. Had low on everything, save textures which were high.Yep, I doubt that is possible to make Hots playable on the rMB.