Professionals say it is Meta Knight, but remember it is an opinion!
It really depends on the user of the character. any character can be the best but also the worst
i Think is dk
No, Tails is not a playable character in Brawl.
There is no best because the person has to fit the character.
There is no single "best character". Try them all to see which one is best for you!
Overall Marth is the best. But depending on your preferences, anyone can be the best.
Master hand is not a playable character in brawl.
According to SmashWiki, Meta Knight is supposed to be the best.
It all depends on personal opinion.
I think R.O.B. is pretty good.