I don't see how you interpreted the humor as annoying. Give me an example.
Rogen: We have millions of people watching our show, and we just shovel stuff into their faces man!
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Franco: That's what people want! Give us some stuff! Manja we the people give us some stuff, Manja Manja Manja!
What? That's not funny. That's just franco giving off a slightly cunty vibe.
Franco: GET THE GOAT! GET THE GOAT!
I got some questions for that goat.
Great, more franco screaming.
Franco: Look! Look at this buttforget!
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When you score a binladen, or a Riddler, or an oohm*? YOU TAKE IT BY THE BALLS
The stupid joke about how "they hate us 'cause they ain't us" where franco deliberately says star fish all the loving time.
Him screaming shove it up your butt when Rogen needs to shove the thing up his butt
Him screaming every second line.
He's one of those stupid blond tropes but is a white brunette man.
He swears for humour. Swearing for no reason isn't funny.
Rogen's character was bad because for the most part it was semi-realistic. He acted sassy, but responded like what was going on was real. And that's a bit boring. He did good acting, but he was acting for the wrong role.
Franco's character was just a 14 year old girl who only reads tabloid magazines and talks on the phone. He was a bitch, swore for no reason, oddly enunciated syllables for "dramatic effect" and the character was a play on so many different tropes and clichés that it didn't know what it was. I don't want to pay to watch a movie where someone pretends to be a stuffty stereotype instead of convincing me that they're a legitimate person through good acting. Skylark isn't a character, it's Franco being a stuffty actor.