What is wrong with the MP part? The only argument that I have seen is that the MP is not as fast as Melee. I get you want to change move sets but the move sets are all really well done right now. Perhaps the clones could use more moves but outside of that, most the move sets are very fleshed out.
I think surpassing Ultimate is going to be a massive challenge as it is pretty flawless on the MP side IMO. That is why my posts focus on Single Player which is pretty boring at the moment.
Online play could be better as well.