You seem to have a mistaken concept of what MVPs are, OP, as well as what it takes to become one. You can find all the criteria (and as far as I'm aware, this is the criteria in its totality) in this thread:http://us.battle.net/wow/en/forum/topic/4038704715
MVPs are players like you and I are. They aren't required to agree with everything Blizzard does; in fact, there are multiple documented cases of them actively disagreeing
with something Blizzard has done. The difference is, they know how to disagree peaceably, and offer suggestions on how they think <insert thing here> can be improved. It's called "constructive criticism".
You'll notice, in a thread that raises issues without resorting to hyperbole or emotionalist kneejerk reactions, if one of the Community Managers ("The Blues") responds to it, they often give quite a bit of information (as much as they're able; if they don't say something, it's often because there's nothing to say, or they don't want to set expectations for something the developers aren't yet guaranteed to deliver; remember the PTRs aren't just there to let bleeding-edge raid guilds get a leg up on new content, they're there to test
new content to see what is and isn't working). But they dialogue a lot more with players on that level because the original post (or whichever one they're responding to) showed the player was seeking dialogue, and not just a refuse bin to vent their spleen into.
More than that, the game is old enough now that whether through word of mouth or just long-time experience with the game, the things likely to get someone banned on the forums or in the game are pretty well-known. They haven't really changed in nearly 9 years of World of Warcraft.
Blizzard can't do anything with complaints. Those offer nothing for them to work with; if a complainer gets a response at all, it'll usually amount to "Thanks for letting us know."
Someone who doesn't like something in the game who then turns around and says "I think this negatively impacts the game in <insert ways here>, and I think if you tried <insert suggestion here>, things would dramatically improve" is a lot more likely to provide something useful, even if it isn't feasible at that point in time. Also realize that major changes to the game do
take time, as development resources are limited and have to be prioritized for long-term game goals (which they do a phenomenal job of communicating to us, in all honesty), and they aren't typically something that can be implemented in an overnight hotfix (though when they can, they often are).
There are people who are passionate about the math that underlies everything in this game, and they voluntarily spend hours of their leisure time crunching numbers, coefficients, comparisons, and time on the Playtest Realm so they can give Blizzard hard numbers. Take a paw through Ghostcrawler's Twitter some time and you'll see he often interacts with these people (called "theorycrafters") to address the numbers, and explain why they're acting the way they are, or acknowledging that a change might be in order. Blizzard doesn't work in a vacuum: a lot of the improvements in this game have come via direct interaction with the players who are paying for software and subscriptions.
You aren't going to get banned for disagreeing with Blizzard or the MVPs, and the MVPs don't have ban power anyway: only the people whose text is in blue and who have an animated avatar can do so. Their house, their rules: if you don't like it, you have an avenue of appeal, and if you're unhappy with how a given MVP is acting, you're a lot more likely to be heard by emailing, as Snowfox indicated, email@example.com than you are coming to the forums, where you may wind up hearing an explanation from the MVP about why they may have said or done something in a particular fashion.
It's worked for me for nearly 8 years now.