I like them outside of multiplayer battles, there is something amusing about scoring a rigid OHKO against a NPC that was giving you grief, but in a Wi-Fi battle? No, no way. They are cheapness incarnate, relying purely on luck to effortlessly defeat an otherwise competent opponent, rather than by utilising a little smart thinking and prediction instead.
There is nothing worse than getting beaten by an inferior team that you would have otherwise cleaned the floor, wall and ceilings with, due to abuse of OHKO moves.
...Or maybe there is.. I can't think of anything anyways ^.^