i believe, personally, that the rate downs might be with people who disagree with your view on the shaman class and think youre voicing too much opinion as fact.
ive found that the karma system, for the most part, tends to be pretty reciprocating in its rewards and punishments. if you take pains (and it takes pains) to make sure youre saying something as your opinion, you can generally avoid rate downs, and often garner rate ups even if youre supporting an unpopular position or voicing something that is purely non-factual.
that right there would be, in my estimation, the major reason for your rate downs. granted, i cant say whether or not there is a cadre of anti-gaudion folks out there (there might be, it happens), but from my perspective, ive seen you say a number of things that are, for lack of a better term, a drop of fact distilled in a barrel of opinion.
the best thing to do would be to avoid saying something is "obvious" or "widely known", especially regarding class balance. the only things i trust in regards to class balance are what i hear from blizzards mouth and what i see personally, as well as the well-tempered anecdotes of a few individuals i know and trust (rpzip, kouren, tarkand to name a few). for instance, i know what a friend of mine, who is a shaman, is capable of doing in 5's and 3's arena. ive seen him hit 2k in 5's and top 1900 in 3's, so i know shaman arent completely horrible in arena; its working for him, so it *can* work for others. i know he almost got gladiator in season 2 as his shaman, and the differences from S2 to S3 are either not that horrible, or are not differences based in the shaman class (arcane shot dispel comes to mind).
i dont know you that well. i see what you post here, and it seems to be passionate and well-meaning and misguided. in many instances youre advocating a massive overhaul of class mechanics, and my gut and my mind tell me that thats too much. they also tell me that it seems like youre either avoiding or are ignorant to certain salient facts, such as balance in 2v2 (its a game of counters, if you fight your counter you probably lose) and the dependency of one class on others to be successful (warriors were built from the ground up to be dependent on other classes, maybe blizzard wants to take other classes in that direction too, starting with shaman).
so ultimately i read your posts and i come away thinking that youve got this weird love/hate relationship with this class that you want to add some pretty big buffs too. and thats ok. but how it comes out, how you say it....notsomuch. theres suggestions and ideas and discourse being tossed about, but its generally all couched in a lot of "woe is us" kind of speech, with a few broad assumptions tossed in for good measure.
and thats as good a reason as any for rating someone down; its better to support a bad position well than it is to support a good position poorly. posting opinions and suggestions? no rate down needed. posting opinions thinly veiled as fact while adding various global generalizations? thats not so good, and in some peoples opinion, worth a rate down.