PS Vita Reviews just finished the handheld's first MOBA. Here are their final thoughts on the game:
"Invokers Tournament is the first MOBA to grace the PlayStation Vita and a free one at that. On the downside, some of the controls aren’t explained to you at all, there is a little lag in multiplayer, and there are a couple small hiccups in the gameplay, most notably the sluggish pacing. The game’s not a terrible MOBA, but you’ve got to be able to get comfortable with the pacing beforehand."