I think it's better to have an open mind to all movies. Some big sell movies can be very good. White cat black cat has been a tremendous success and could easily be considered a big sell movie by european standards. That doesn't make it bad.
Not sure what you mean by big sell movies Fenix, you mean movies that are so successful that they make a lot of money, or do you mean movies that comes from big productions?
It's probably so that when you make a big movie production that costs drillions of money, you'd like to atleast break even, so you have to appeal to the masses, and the safest way to do that, is to repeat past successes. And if you don't like that general-successful-type-of-movie you probably don't like most of the expensive movies.
And who's the sheperd? the one watching thousands of hours of lousy polish cultural movies, per 1 hour of great polish cultural movies?
Depends on your definition of entertainment I guess