i don't understand what you mean by hollywood politics?
Very often it is foreign language and independent films that get good ratings and that is because Hollywood very often churns out the same mindless nonsense not because of politics. Of course it is all opinion but when the public give films a bad rating because they have subtitles
I do in most cases prefer the opinion of a critic.
A director who is disliked by the 'scene', a film featuring actors who have rubbed journalists up the wrong way, a director who is good friends with influential critics and their production is going to head with another big threat - Just a few examples of why critics would 'pan' or 'over-rate' a film - it's all a business, like anything else, and it's about cash at the end of the day. We're talking about 'movies' and 'hollywood' here - to think the inside workings are straight and honest, would be silly.
I'd listen to the public over critics any day of the week, but that doesn't mean I wouldn't consider the thoughts, or opinion, of somebody who reviews films for a living - however, just like reality television, you're not sure if what you're seeing is real.