I get really annoyed at the riding school I am at.
The horses are really, really dead to the leg. Even though it's clear they have some training they usually just don't want to move so much that you can hardly focus on anything else but getting them moving. The instructor has told me I have done better than most people at getting them moving forward but it is just constant leg and seat just to get them to stay moving, much less push them into collection.
I feel like I can't learn anything because even if correct my aids have no effect. It depends on your school, but in some places I think you can only go so far on horses that constantly ruined by dodgy riders.