How do you feel about post dislikes and like based "rating" system?

[Pharone]

... I, and I would say the majority of others, ...

This is the kind of statement that likes/dislikes/upvote/downvotes works against. Let the users say if they agree with you or not. You simply saying they agree with you, is just you assuming you are the majority. You may be the majority, but how about letting the actual user base confirm that for you instead of just assuming it.

Also I hardly think anyone is using multiple accounts to support their dislike of an idea.

You must not have ever been part of the EverQuest community. This is a regular practice over there. You see "new" forum accounts all the time, and they generally parrot the same points of view of very vocal individuals that argue on every single thread. It's way more common than you probably realize, and it is very destructive and toxic behavior.

And don't get me started on the people who blow in from nowhere then flood the suggestion forum with a dozen ideas ranging from "Completely re-write your game engine from scratch" to "Lets do away with leveling altogether" and then mysteriously disappear a week later only to show up again in a year to re-post the same nonsense or 'bump' their completely unresponded to posts.

I hate that too. This goes right along with what I was saying about disgruntled ex-customers that troll forums for games they no longer play just because they are hateful individuals.

/agreed 100%.
I dont think an upvote/ downvote system will change that.

I feel like an upvote/downvote system will allow the customer base to over talk the vocal minority that plague the forums. If you have six people that post on every thread arguing with anything anybody ever says, that's going to be six votes (up or down). When you add in the one hundred or so other customers (for whom never or rarely post/reply) that come along and upvote/downvote a thread/response, then it helps drown out those six bad apples.