yeah, i mean, any system that tries to quantify a subjective overall reaction to a piece of art is gonna be massively, inherently flawed. it's fun to interact with those types of gauges but it's ultimately sort of "absured."
i like to read the reviews of the guys i most trust (right now, a couple of my friends and then Drew McWeeny and Walter Chaw) but i never agree with any of them 100%. forming your own opinion is, really, what most art wants you to do, anyways.
i haven't seen Interstellar, obvs, but it is interesting to note this growing trend of "it was too ambitious and failed on the execution" and so then the critic ends up giving the ambitious but flawed movie a lower rating than, i dunno, Battleship. i mean, i guess you can value the execution well over the degree of difficulty and that's perfectly valid, but for me ambition and execution are of equal merit (perhaps i even value the ambition a bit more since there is so little of it coming out of Hollywood these days).
no doubt, Nolan's movies can get a bit clunky at times and sometimes that only gets magnified because of how ambitious they are, but as someone else was saying, i've come to accept those "flaws" as part and parcel with some of the same things that i love about his movies (such as, the fact that he's even trying to convey some heady concepts but doing so through the vehicles of large-scale, popcorn genre movies).
can't wait to see this movie.