Canon, I really like your posts. : )
For reference: When people start complaining about Diddy/Lucas/M2/BOOMERANG, while the most obvious or emotional thing is what comes out first, it is usually tied to another thing. This is something that we in the PMBR have to examine before thinking about changing anything--- whether it is a boon or a bane.
I find parts of Diddy Kong to be pretty egregious (my opinion, not PMBR). Fair is lame, fsmash is good, and I don't like being in a Choose Your Own Adventure (dash attack-- you die generally offstage any way you slice it)... but even with this stuff, it's attached to someone that has a great DD, good OoS with a banana or without, an annoying recovery to edgeguard, is very fast, has a move that you can option select with (side b), long distance tech chases/confirms and a good ability to snowball momentum AND the ability to wall and out camp you.
And maaaybe, maybe... just maybe, this character is a bit too good?
It could just be me.
It's just you. Diddy gets combo'd badly as a fastfaller, is actually edgeguarded fairly well once you learn it (there is only a single point in his charge process that can sweetspot the ledge, if you can scare him in to holding his up-B charge past that, you have a guaranteed smash on him because he will pass the stage lip and you can just start charging).
Compare this character to Fox. His fair is good, but less good than upsmash
or shine individually.
Compare this character to Marth. His fair is good, but Marth has that stupid grab range, a fair that's just as good if not better, and dat fsmash.
In fact, Diddy has the tools needed to keep up with the Melee greats. He's not quite as good as them but makes up for it with a good recovery. Diddy is a good character designed to keep up with good Melee characters, but he's not better than them. IMO he's right around the #10 spot in the game if you made a tier list (Fox, Falco, Wolf, Marth, Link, Lucario, Mario, Mewtwo, Lucas, and a few others are probably better).
However, the anti-Diddy metagame doesn't exist right now. I see very few people except Mew2King and my practice partner edgeguard Diddy well (they seem to assume I am going to sweetspot even when it's impossible), and very few people use bananas. No one in my region has even used a glide toss against me, and characters like Mewtwo and Marth have insane glide tosses, and Peach probably beats Diddy...
There's no reason to nerf Diddy. He just requires significant mentality changes to fight against (like Jiggs and Peach), and people scream nerf before putting in the time.
If Diddy gets nerfed, he won't be able to compete. He has plenty of flaws and his "stupid stuff" people complain about isn't as good as other top character's good stuff.