Despite the fact that a lot of his posts can seem brash, I agree with him, and just because he's playing a top tier character doesn't mean he's blind to the fact that people can be good with low tiers, though the rest of you should know that Ganon isn't the greatest, and he'll never be. It doesn't matter if YOU know how to use a character good or if a low/bottom tier can beat a top tier - the fact of the matter is that there are several reasons as to why certain characters are underused in Brawl.
Zelda is probably underused because of her rep in Melee and because of Sheik. Zelda isn't unpopular, so it's safe to say that Melee is the clear reason. She has picked up popularity, but she's still woefully underused. However, it is clear to everyone that she's much better this time around, and so the main reason I would say she's underused is because of her Melee rep, and not because of her raw abilities, as she's a good character in general.
Ganondorf, on the other hand, stands out from the crowd anyway just by being who he is. People know who this character is, and they're probably more interested in him than, say, R.O.B. Yet he's probably just as underused as, if not more than, Zelda. Why do you think this is? He was good in Melee, and that means he's not despised as a character because of the previous game. He's a known character of the Zelda series. So there's some other factor here that makes people not want to play him? Do you know what that is?
He's not a good fighter. You CAN be good with him, but the bottom line is that he is not good. If Ganon was about as fast as his Melee counterpart, he would shoot up as a fighter. The Ganoncide and his other buffs didn't keep him from losing popularity as a fighter. The simple fact is that people see that he's not a very good character (and don't even state the learning curve crap, if anyone reading this was ready to throw that out), and therefore he's not going to do well. You have to PROVE to people that he doesn't get beaten up by a huge chunk of the cast, yet it's clear to us that he does get beaten up, and nobody who is playing to win is going to take that huge risk with Ganondorf.
So, Falcon is correct. Anyone who acknowledges that Ganondorf, pound for pound, isn't that good is correct. Anyone who believes that good Ganon players can beat good MKs, Marths, Dededes, etc. is correct... so long as they realize that Ganon doesn't have the best chances out there. Anyone who takes that, "Oh, _____ is good, but people just don't know it yet and they don't know how to fight him" mentality is just in denial.