I think it's time to put Diddy Kong higher...
I play with him a little bit and he really is good (and also annoying for my oppenents)
Also Toon-Link, Lucas and Pit should be higher.
I know a lot of people think Pit is only standard with no really good things, but if you play a good Pit who knows how to play with the Arrow then its very difficult (I know one who can do perfect Arrow Loops while fighting as he wouldnt control the arrow at the same time o.O). Lucas is a good damage dealer with Side-Smash as one of the best finishers and has a crazy recovery from the side (not that good from bottom but it's OK)
A good Toon-Link will combo you and wont let you do anything until ~80% somtimes... really annoying :/
Wario also will climb up the tier list i think, he attacks by farting wtf xD
If a lot people would play Luigi and would play him good, he would be high as well. His Down-B recovery can kill you while edgeguarding with some Characters. Also he can do 50% Combos on the most characters at low % then killing with Side-Smash, Up-Smash or up-B :/ You only have to learn how to handle with his unnormal floatiness :/
Also you always have to be in danger when he charges missile...