To me it's also about the overall feel of an episode/movie and if the mix of "fun" and serious drama fits the story. My main problem with STB compared to ST09 and STID is I didn't know if I was supposed to take the story as just a romp or something far more serious. Krall was a very sick man not just a moustache twirling villain. He was supposed to present a valid challenge to the principles of the Federation -- metaphorically to the existence of "Star Trek". Yet, I don't think the story ever approached those areas with the appropriate gravity and even horror of someone who existed as he did and for what he did. I don't know. The salt monster in "The Man Trap" was handled with more gravitas, in my opinion, and it preyed on people pretty much as Krall did. In short, in terms of talking a balance seriousness and fun, the balance just seemed a bit off to me in STB given what I expected from Krall, what he did to the Enterprise and its crew, and the overall theme of the movie as it was promoted.
That, and the situation was grave, but everything turned out to be so easy for them to do. The tone always seemed light. They never seemed in real danger. There was no real drama to the plight. No sense of "they're not getting out of this."