iCarly is about a teenager named Carly (played by Miranda Cosgrove) who produces a popular webshow. iCarly is also one of the most popular series in the history of Nickelodeon. That doesn't mean it isn't full of holes.
While the premise is good. Some plots can be good some can be bad. I like episodes centered around Carly's webshow than one about some boyfriend she meets and she and Sam fight over him. There isn't much in the form of humor on iCarly.
Occasionally you might get a good joke, but many times you just get a character screaming some random line that's supplimented by a laugh track. The laugh tracks are there just too make things look funny when there is little actual humor.
The acting isn't so great either. The actors and actresses all sound so sarcastic, like they don't mean anything they say. Very little feeling is put into it.
All I can say is at least it's premise is pretty original has little to do with music like we've seen with lots of other shows in the same genre. Can't say anything too good about the humor. There are lots of things that need to be fixed, like the laugh track or the acting.