I have 2 points to make:
1. What is the fascination with seasons 1 & 2? I think you people, who perpetually hearken back to the "good ole days" of those seasons are in the minority. EVERY fan of the show that I personally know, finds those seasons to be by far the weakest of the series. Even through those episodes are what started it all, most of them don't really hold up today.
I remember when the season 1 and 2 episodes originally aired, and I liked them a lot.....However, I was 12-13 years old. Honestly, when you watch those episodes now, do you really think that they have the same wit and sheer originality of any of the episodes from season 7?
Just because those were the first two seasons of the series, it doesn't necessarily mean that they are the best and brightest of the show. Personally, I would rather watch "The Principal and the Pauper", an episode which is now legendary for being ludicrous, than any episode from season 1 and most of the episodes from season 2. From season 2, I like:
"Oh Brother, Where Art Thou?" "Three Men and a Comic Book" "Dancin' Homer" "Bart the Daredevil" "Bart Gets Hit by a Car"
2. The episodes from the last couple of seasons have been sub par overall, but they haven't been bad enough to cancel the show. I can't believe some of the extremes with which some of you criticize the show. However, you do have your opinions and I respect that.
For me, the show is a source of joy, and there has always been something redeemable about any of the episodes from the last couple of seasons. While they haven't been at the level of genius of the episodes from 4-9, they are still in that same vein though. I guess my main complaint of these past couple of seasons, would be that the roles of the supporting characters seems to be diminishing. What I mean is, it seems the focus is on the family more and more, and the supporting characters just seem to be around to tell jokes every once and awhile.