Okay, look, its wrong to go and say "worst episode ever" every week without backing yourself up with real arguments, but its also wrong to say that anyone who ever expresses any kind of criticism other then "this show is the bestest!!111!" isn't entitled to opinions.
And who said seasons one and two were mostly about Bart? Going over the list of episodes, I found more of a tendancy towards Homer then Bart actually. And for the matter, the middle seasons were generally well balanced (seasons one and two were also really, but again I noticed a strong tendancy toward Homer) between each character. I don't think, save for seasons 9/10+, that its ever been either "The Bart Simpson Show" or the "Homer Simpson show". I think people simply create notions about the episodes based on which characters were popular and why at the time, rather then actually watching the episodes and maybe listening to the commentaries (you'd be suprised what they say about the so called "catchphrases")