It's not about being at a certain skill level. It's about being able to articulate why it is that you don't enjoy something, beyond, "i'm bad at it, therefore it isn't good." If you feel a game is poorly designed and doesn't accommodate someone of your skill level, and is exclusionary to a hardcore only crowd, cool. If you're mad because you're getting bodied by the lvl 30 skeleton and you're level 1, and then complain about why the game as a whole is garbage, then your opinion gets the bushes treatment. If you don't like it (due to not being "good" at it), then that is cool as well. That's different than saying a game is horribly made.
Same thing with movies. If you don't understand a film, then you should be able to point out what muddled the film's language and why those missing aspects undermined your viewing process. Nobody listens to a critique that reads, "I didn't understand the movie, 1/2 star," or at least, I hope that they wouldn't. That applies to literature as well.
It's also not about defense of an inanimate object: it's about discussion.
edit:
lol. word.