From what I could tell it feels kinda of like a mix of Brawl/Melee in terms of it adds the Offensive capabilities of Melee and the Defensive of Brawl and kinda puts them together which I like instead of just being an O/D based game, but I think it might speed up a bit more in the Wii U version with Gamecube controllers :D
I liked Melee a decent bit but it kinda sucked because when I played at the time I wasn't too good, and Brawl was one of the first competitive games I played on Gamebattles for awhile.