The puppet Yoda from Empire and Jedi was such a warm, wise and likeable character.
CG Yoda from the prequels had zero charm, with a permanently constipated 'Watchoo talkin bout Willis' expression.
You could never replace the CG crap with a puppet though because of the spazzed out fight scenes.
Of course you could cut the fight scenes out entirely, but if you start cutting out all the bad stuff from the prequels then... there's not a lot of movie left!