I'm not gonna post an all out tier list but here are some of my thoughts:
Regardless of what has been said, I believe Olimar and Sonic are underrated. Olimar, while very annoying and hard to control with very weak attacks, can be quite annoying if you're good at controlling him.
OLIMAR:
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Sonic, on the other hand is extremely powerful. He's fast, he can hit stuff, then get out before he gets hit too much. He can also grab the smash ball before anyone else due to his vastly superior speed, and has a great final smash, despite being relatively easy to avoid, if it gets you, you're gonna take a beating. however, since so many matches nowadays are itemless, that goes out the window. He can still get alot of hits in a game and surprisingly pull out a kill if he can rack up the percent. with more than 2 players, however, sonic loses his luster and becomes a damaging convenience for the other players, whoever isnt being attacked. He is also extremely ineffective against Ike, who has ridiculously strong attacks and can counter sonics frequent annoyances and send him flying.
SONIC:
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Lucario, in my opinion, is also very good if used properly. While he is slightly predictable if he tries to counter, he's very good at avoiding pesky fast attacks and dealing damage back. He also has a handy Aura Sphere which increases effectiveness as he loses health. This is a great weapon to pull a kill out of the hat once you've taken some hits.
LUCARIO:
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Wolf is, I'm sad to say, disappointing for being the last character unlocked. His attacks do little damage and he's really easy to self-KO. Plus the fact that if you mess up and tilt the analog stick just a little to the side when doing ^B attack, you essentially lose the match.
WOLF:
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Lucas is probably my favorite killer. His ranged attacks, unlike ness's, can hit more than one person in a shot. He can trap opponents with PK fire and them hit them with his baseball bat, which, if played correctly, can net him a kill. He can also freeze foes for a second with PK Freeze, another annoying attack. Finally, he can ram himself into opponents with PK Thunder, causing massive kickback, usually his greatest weapon if pulled off correctly. Despite the difficulty of using ^B as a jump, lucas is a very efficient player and a threat to be reckoned with.
LUCAS: