Sylvester Stallone must have been absent the day this was discussed in class.
I actually liked Rocky 2 and 3 was okay with Mr. T.
Other Sequal Stinkeroos:
Beyond the Poseidon Adventure
The Sting 2
Jaws 2, 3, 4
Halloween 2-10
Friday the 13th (all of them)
Major League 2 & 3
Speed 2 (although Speed 1 pretty much sucked)
Rambo 2 & 3 (See Rocky 4 & 5 as well)