I can probably state that while I was willing to get Smash Wii U on day 1, I never had that feeling with Ultimate. With Ultimate, it took away the things that I liked about Smash 3DS / Wii U, which include custom specials, Final Smash movesets, and even the 3DS exclusive Smash Run.
In terms of the Final Smashes, they were never meant to be used competitively, so it's baffling that the developers replaced a lot of the unique Final Smashes with Triforce Slash or Blue Falcon copycats. Heck, you can't even play as Giga Bowser without hacking the game.