Worlds will never be legitimate until they make the draw open to all teams that enter it, get rid of the round robins and make it best of five, you lose and you're eliminated, tennis style.
The current format is just an exhibition for the teams that have done well in the LCS to play each other ten times a piece over the course of a month...there is absolutely no reason teams shouldn't have to play every other day against a team they have very little experience against or research on. Not only would this open the bracket and ensure that the best teams right now have a chance to win but it would also create many more compelling and interesting games/series. Most of the time the top seeds would win and face each other in the later stages anyway, but they would be well practiced and at the top of their game.
Also blind pick for game 5 seems like a no brainer I have no idea why the NA formats shy away from it, or if this worlds will use it.