I dont have an opinion on him really, he was just there to me, like most Zelda villains are. It would have been nice to see him in a 3D game, if MC itself were 3D it would have been cool to see him in that dimension but i'm not holding my breath to see him come back any time soon, i didnt really like the story in Minish Cap and he was very central to it, i also dont see anyhting of the Minish Cap coming back in future games since it seemed very self contained and not even FS or FSA had anyhting to do with the Minish as far as i know, and races unless theyre the Kokiri, Gorons or Zoras dont make a habit of coming back even in part roles so.. its probably unlikely that we'll see Vaati again, but im not too bothered either way.