I really think these demos (at least the 3rd party ones) are doing a poor job at representing what the games are about. (With the exception of Contra 4)
The Hulk Demo was a training level so boring I felt not like the Hulk but like a a...I dunno something boring and dull.
The Kung Fu Panda demo was a training level that showed much promise...I like the control scheme for the most part...and it worked for a kids game, but I wanted to experience a level with actual platforming and combat going on at the same time...that would have been nice.
Cake Maker 2 was incredibly boring...how is that a full game?
I dunno what else I tried, but the developers need to think about making an actual level or perhaps the second level or something the demo, and not the intros or training stuff...because it just doesn't work.