Well, your Ganon was more 'On his toes' in the Diddy Matches, so to speak.
He was faster and buffered more.
First off I agree, playing Diddy does feel faster and looks better, but game play wise I am un-sure of whether or not it was different in the level. I make plenty of mistakes in my game trust me. I am not disagreeing nor am I agreeing with your opinion on whether these new matches were less impressive as you say, but hopefully this makes sense.
Diddy kongs (especially AZ's) plays quite aggressive and faster paced. It can be played slow, but most play aggressive. You have to adapt a different play style for different match ups in my opinion. Against Diddy I have to be able to play at Diddy kong's speed. This is why my Ganon looked faster. I can agree my tech skill was not exactly perfect in these new matches, but my tech skill can always improve.
I have to be faster against Diddy, and I have to adjust to his level of play. I have tried to dictate the speed of play against a Diddy and it never seems to work. Against Falco, I can dictate it more, and it's sort of boring to play and watch as I have to shield a **** ton, and trick them into my combo's. Wario I just need to get my pot shots in until I can grab him, also a very campy and boring game. D3 is the same, space until I can get a hit in. otherwise get grabbed and eat a lot of damage. Ice climbers is weird, not champs best performance, but it gives some idea for people of what I do against them. Game and watch I hate playing because It's very campy as well. I dictate those match ups to be played slowly, because Ganon is slow. He has little options and has to wait for his hits. Dictate the speed of play against your opponents to control the match.
Perfect example of someone who dictates game speed is Ultimate Razer. If you watch him play he is very flashy and very aggressive. He is in your face with grenades, C4, and tilts all day. he FORCES you to play at his speed, and if you can't adjust you will be in for some hurt. Making people play at your speed, brings them out of their game and can cause them to make serious mistakes they wouldn't normally do.
Diddy kong I have been unable to dictate there speed of play so I adjusted to play at that speed so it seems to be a faster paced game. These other match ups are slower and less interesting to watch (and less fun to play). I wish it was about looking good, but I am playing to win.