A rational and "impartial" critic judges a movie first and foremost on its own merits, as opposed to looking for things to like or dislike about the film. Obviously, no one can be totally "impartial about anything but when we use the phrase "impartial," everyone understands that that means. While a critic of BvS can indeed criticize the movie for its crazed adaptations of these characters at the end of the day they must also be willing to accept and judge the movie as its own thing. BvS is one of those truly horrible movies that fails on multiple levels, it is why you see so many nitpicky things cropping up in this thread. It fails both on a high level and a low level.
On a high level it fails for many critics as a competent, coherent and decent film. The editing is scatter shot, the writing is all over the place, character motivations make no sense and seem to change on a dime, there are too many subplots which aren't tied together to a satisfactory conclusion, etc. These are the fundamental problems with the film outside of "Batman is murderman" and "Lex Luthor is now a Joker copy." Now, once the film is exposed as bad on a high level that leads to nitpicking of everything else on the film on a low level. However, if the film were a decent movie on a high level while there would still be nitpicky complaints regarding the adaptations of these characters it likely wouldn't be categorized as a bad movie. It might perhaps be labeled a "bad" Superman movie but not a bad movie altogether.
In any event, I've listened to just over an hour of this podcast and I think I'm done it's exactly what I expected, the ramblings of a deluded fanboy looking for positive things in the movie that are not there. He shifts and quibbles about every critique levied against the film lapping it up to either people, "not understanding" what was going on or "misinterpreting" a scene. He goes so far as to argue that Superman didn't kill that warlord in the beginning but merely dragged him behind him as he went through the wall. That was the point I realized I needed to stop listening as he had abandoned all logic in his pursuit of clearing BvS of all critique.