You know, I find it weird that people keep saying things like this. Just because Hal Jordon doesn't have Deadpool's mandatory stupid joke quotient doesn't mean he's totally bereft of a sense of humor. Even if he was, wouldn't this be a good opportunity to, I dunno, maybe try a slightly different interpretation of the character?
Plus it's not nice to Mr. Reynolds to imply that he's only worth watching if he's constantly cracking jokes.