10. Hate: The Flying Controls
While each of the games has similar flying segments where you fly around and collect sets of objects and enemies, there are also "Challenges" that appear in the second and third games where you complete a race or trial given to you by Sparx or Hunter.
In the normal modes, the main frustration comes from the "all in one" category where you need to execute a perfect run, grabbing every item set all in the space of one run. When it comes to challenges, the most difficult part can be racing the AI or shooting a certain number of enemies.
The main drawback in all of these is how "heavy" the flying controls are. It is easy to under-correct and sail slowly into the water for an instant fail. Especially when compared to the tight on-ground controls, these flying segments are made harder by the fact that Spyro handles like a barge and you are constantly fighting to keep him even vaguely on track.
Coupled with some challenges where a single "bonk" or a missed boost can spell doom, you can end up repeating levels over and over with your frustration rising gradually as you go. Faithful to the original, but still annoying.