Basically, we are given a character or a concept, and we rate them in 2 categories:
Chance - The reality of the character can get into Smash Bros. This adds up Sakurai possibly picking the character, the characters popularity and relevance, and the chance they have getting in through the ballot.
Want - Personal opinion of the character. You can be as bias if you want. If you be bias on the chance one though, thats when some of the members of the forum like to speak up and point out "flaws".
Its best to support yourself more on the chance rating, you could pretty much put 0% or 100% on the want and not be hung for it. For more information, check out the OP of the thread. Its in this board of the forum
I feel like it would be to each his/her own. We don't really want to start arguments on the thread because there already have been plenty and we don't want to get the thread shut down. Just list your support on your post. If anyone quotes you for it, just try your best to ignore it