Those who say that it has no jokes (not is unfunny but actually no jokes) just missed them because unlike mainstream comedy these days where you need a flow chart to explain any references they just slip them in, much like unforgotten realms: "but how do you know they were witches?" "I don't, do you have a duck?".
Personally I love it but no-one has mentioned the radio show yet, in my opion that was the peak and agree that series three was bland.
The comdey isnt all silly hats and randomness they do have alot of cultural references.
As for not liking Garth Marenghis that is because you arent familiar with the film bussiness, most of the humour I've found in that show was it going out of the way to break rules, like continuity.
All being said it is perfectly reasonable to not like any of this humour, its satire, just like I dont like Ricky Gervais because its black humour, we're supposed to laugh at people who are laughing at disabled people? right....