It's kind of hard to do that when two of the five main characters are walking, talking, internet meme machines, amidst a game that tries very hard to make you laugh using edgy off-color humor, then slathering on a little bit more of that internet "culture" for assurance. They took Jack, the only rather solid character at the start, and threw him down said dark and edgy hole in order to create the travesty they call an ending.
At the end of the day no one is in it for the writing. (If you are, you're part of the problem.) It's the gameplay mechanics and level progression that they're in for and keep coming back to. Hell, that is why I have two maxed characters myself.