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Rumor has it that the Simpsons animators did a test that was similar to "Funtastic World of Hannah Barbera", in which the 2D characters were laid out in a three-dimensional space. Despite the fact that it looked good, when Universal saw how much it would cost to make the four-minute ridefilm (which was decidedly more expensive due to the large format film) they freaked and decided to lower costs by making the entire thing CGI.
And good god, despite their best efforts it looks awful. I also agree that it's dim in many spots. I appreciate how they updated this type of attraction, but I agree with Jon in that the queue is abhorrent. Even gate A access doesn't help, it's always a guaranteed lengthy ten-minute wait of sitting thru the same two pre-shows everytime to get to the ride, and I just don't have the patience.
Topping it all off, I'm actually a Simpsons fan! While admittedly some of the lines make me chuckle (and I appreciate the lengthy queue video with many classic clips)... it's gotten old and frustrating much too fast.