I certainly don't mind. One of the aspects of the PL/SQL Challenge that I like best is its transparency.We make available all sorts of data about the quizzes and the answers people have submitted. This makes it possible for you to give me feedback, help me improve the PL/SQL Challenge, and see how other players are doing.
So, first, thanks for asking about this specific quiz. It should not have been marked as an Advanced question. As to how it got that way, I have generally been assigning a difficulty level of at least Intermediate for any areas of functionality that are rarely used, such as object types.
Your email has me re-thinking this approach, though. It seems like what I should do is rank the difficulty level within the context of the functionality area, at least for a feature as broad as object types. There are beginner questions on object types and, you are right - this is one of them.
So here's what I am going to do:
1. Change the difficulty level on this question to Beginner (everyone's scores will be decreased, but your rankings will not be affected).
2. Be more discriminating about how I set that difficulty level. It may be true that few developers use object types, but it is a part of the core PL/SQL language and has been available for years. There is no reason that we should not all be expected to have at least a rudimentary awareness of it.
Many thanks and please keep that feedback rolling in,