Frankly, EVERY film has a plot you've heard before, unless you just came out of the jungle and are seeing films for the first time. Pick any film and you can easily find another film with the same plot if you boil down the details to the base. I think someone once pointed out there are basically around 2 dozen different plots out there, and every film made can be summed up as one of them.
So harping on a film because the plot is familiar is actually worse than what you accuse the film itself of doing. It's like pulling someone over doing 10 mph over the speed limit because, well, they're speeding, when everyone around them was doing 15 mph over the limit.
Don't like the characters, fine. Dislike the acting, the visual design, the music, whatever, that's fine, but saying "it's bad because the plot has been done before" is just a cop out.