The acrobatics in Smash seem really reflex and execution based, so much so that mindgames seem nonexistent, at least for casual Smash fans/casual Smash watchers. I also think MKX is really boring to watch.
Some people think Street Fighter is an insanely boring game to watch. For me, its one of the most exciting games on the planet to watch. Comes down to preference of mechanics, mindgames, what the fundamentals look like, even character selection.