All I can think of is "Didn't this help mess up Watchmen? The director's cut helped give a lot of characters some actual personality, which included some extra jokes in the mix."
And seriously, that missing content is what makes the theatrical version absolutely inferior to the director's cut. How could you miss the lesson that given more rounded personalities besides "these people are action heroes in costumes" makes for a far more entertaining piece when it's a lesson learned from something you guys made yourselves?
Hell your animated movies have been getting darker with your switchover to the new 52-ish set up (ever since you guys did Flashpoint) and they've still included a lot of humor to help round out their characters. Hell, Arrow, the show where Deathstroke says with a voice so gravelly it could be used to polish diamonds just how he's going to destroy everything about the main character's life in vivid detail, and then proceeds to do so for episode after episode, is half based around humor, and it's popular enough that it's onto season 3 and has spawned a lighthearted Flash spinoff.
You're not just missing the point of Guardians, you are literally ignoring your own history and crippling yourself right out of the starting gate.