Sorry man, you're wrong.
http://super-smash-bros.wikia.com/wi...TSC_tier_lists
He was at 3rd place in the first tier list of the original Smash, but if I remember correctly there was some sort of catch for him being there. Like an * or something.
Then the tier list was reissued and he plummeted to the bottom :/
But if you persist that the first tier list lasted for quite some time, I'll give you that one. I'm fairly certain that the new Smash Bros tier list came out quite recently (relatively speaking).
And he's always been bad at Melee ><
In fact, one can say that the transition from Melee to Brawl was the best thing that happened to him. Which sucks since I also like Lucas a lot too, and sometimes I can't choose between them XP
The main problem with Ness is his unsafe recovery (as great as PK Thunder is, one misses the ability to double jump) and having horrendously long grab release animations, where it gives other characters openings to do infinite combos on Ness, which Ness is quite prone to. Don't get me wrong, though. I really enjoy playing as Ness and I personally find his throws to be the most satisfying to use in the game. There's something about having the choice between stamping on someone's face with fire shooting out of your fingers or just skyrocketing your opponent into the sky with the power of your mind that appeals to me XP
I'm surprised you haven't mentioned DeDeDe's best ability in Brawl, which is the power to easily pull of incredible chain grab combos. But all what you said is very true, and I really do think DeDeDe is one of the best characters in the game. And I also think he's one of the coolest! I really do like DeDeDe's character in the Kirby series and I thought Brawl gave him an incredible translation of his abilities. AND HE GETS TO THROW WADDLE DEES! <3