first of all we should respect "what type of shows we like" and what others like
there would be some who go for the "adult humor" in cartoon as in simpsoms, south park, futurama and others
others like the "normal situation humor" like king of the hill, wait till your father comes home(I know my classics) or the "in betweeners of "realistic with fantastic situations" as Flinstones and jetsons
some like the "battle type" where the protagonists are trying to be better than others as in Pokemon, ran-ma 1/2, dragonball and such
the card based ones, like Yu gi oh and such
there are the "warriors storyline" driven such as inuyasha
the powerful girls ones like power puff girls, sailor moon and such
the science fiction style of adventure, like Buzz lightyear, spaceghost, voltron and such
the "super hero" type like teen titan, batman, spiderman, x-men, superman, aquaman, gargoyles and such, even ones like Ducktales and others from the "disney genre"
the silly comedy ones, like sponge bob, ed edd and eddie, fairly oddparents and such
the kid's everyday life, like hey arnold, recess, all grown up, and such
the "imaginary ones mixed with real life", like rugrats
the "extraordinary SITUATIONS" like TKND, code lyoko and such
the straight adventure ones like Danny phamton, kim possible, jake Long
and many others
avatar is kind of unique, it is like a combination of jake long or danny phamton with the trilogy of LOTR or harry potter, so it is more likely to have a fan base that involves more demographics
al of them are unique, there might be some who only like very specific type of cartoon, some who like various, but not all of them, some who like almost all of them
some who enjoy not much plot, others who enjoy a highly amount of plot and storyline
and actually you should look at the "silver-lining" of so many avatards coming here
it means that your forum has become "more active", and usually the TV-com moderators(not editors) will put a lot of attention to "how much activity" is in each forum to "know" which ones are the "most popular"
I am sure there are COUNTLESS people who are fans of "the thornberrys", but that forum has not much activity because that progam is not shown much anymore at all
sorry for the long post