Since your kid is a kid, I'll tell you the rides <i>my</i> kids think are useless.
They would agree about test track - they think it is about as exciting as a ride on the interstate. They also do not like Kali River Rapids (the one at AK, whatever it's called.) My daughter said you might as well just stand on the sidewalk and have people throw buckets of water on you!
They would stand in line without fast pass for RnR roller coaster and tower of terror. They also love the Dinosaur ride at AK and all the mountains at the MK!