thats the problem with critics they cant just sit down like normal people and just enjoy a movie they are in critique mode the moment movie starts critique every single line of dialogue
a big thing imo that critics do is they dont look at a movie for what it is and for what it is trying to accomplish and critique for what it isn't
You got it right, but I think it's hard to turn off, they're paid to criticize a movie which is frankly ridiculous. Good critical reception matters less than the box office performance of those movies, a guy like Shyamalan keeps getting work although he's on a very bad streak quality wise, but his movies usually make dough, so yeah. (although I like After Earth).
Fact is the concept itself of the critics doesnt make any sense, somebody with his own views, with his own perception of what a movie should be or shouldnt be like, full of biases, or preconceptions, telling YOU what he thinks about a movie, and some of them (like Drew McWeeny, that I like, I usually agree with him, but he's really agressive on Lone Ranger, too much) even tell you flat out "Don't go see that movie".
Considering that everyone has a different opinion, different vision, it's just flawed, plus you can't criticize a movie according to a list of criteria or something, like does it tick this box or this box. Too much of this these days like with Man Of Steel or The Hangover, or that kind of thing, is just flat out either loving the movie or destroying it, no in between.
Even the worst movie has qualities (well, depends

), even a movie that is flawed on every level will succeed on another one, it's about what YOU see in it and how it makes you FEEL, thinking about it, there is not really an OBJECTIVE criteria to judge what is good and bad, it's just your view on it.
Lately, I judge movies more & more on how they make me feel, and if they leave something a few days after I've seen them, now, yeah, sometimes, it's bad, in an obvious way, but there's so much more to a movie than simple variations of good & bad.