I directed this more toward Melee top tiers. I guess a better explanation of the idea is I find Fox, Falco, Marth, Sheik, Peach, Jiggs, and Cfal bland and uninteresting because their respective metagames are fully developed. Melee vets who have been completely retooled are fascinating to me, as I they have much more unexplored content to mess around with. Ganon and Pikachu are excellent examples of this. While the option to play them the same as their Melee counterparts is available, there is a huge amount of new metagame you can explore. Ganon has a new side-b, more options to approach with, and a more fleshed out bait game than he did in Melee. Pikachu has QAC and new aerials that can drastically alter the way the character acts in neutral. Both of these characters were solid in Melee, but now that they have been altered in PM, playing them is much more rewarding and engaging. In the same vein, Brawl characters are brand new to me, and are equally interesting.
Hopefully I explained my thoughts a little better this time around.