I like reading when people do 1 best and 1 worst from each park, so that's what I'll do (besides, I have to go to work in 15 minutes so there's no way I can rate every ride).
MK:
Best - Splash Mountain (10)... Always fun, and the normally obnoxious children that wait in line with you are pretty calm because they can hear the screams from the ride...
Worst - Hall of Presidents (1)... I know a lot of people love this attraction for a.a nostalgia and whatnot, but it puts me to sleep, and it's bad enough to have to listen to GWB speak on television, let alone a theme park.
Epcot:
Best - Cranium Command (9)... When it's open anyway... Love the voices, love the theater, it's great.
Worst - Spaceship Earth (1)... Another one that people will think I'm insane for, but it never has appealed to me, as a kid, a teen, or an adult. I give it a try almost every time I'm there though.
Studios:
Best - Muppetvision 3-d (10)... In my opinion, the best attraction in all of Disney... I've heard a lot of people say this, but I'll say it too... I've seen it 100 times and it has yet to get old, and cracks me up every time.
Worst - Sounds Dangerous (2)... For the ending alone, which they could've done much more with... Plus I had to sit next to a screaming child who wouldn't stop for the first 2 minutes once the lights went out. I'm talking CONSTANT screaming.
I've only been to AK once, and half of it wasn't open, including dinosaur, so I don't feel I have the right to play favorites there yet. Check with me again in January.