It really depends on the show. The local "big" quilt show is put on by the 3 local guilds and spans a huge range of skill and type. They have a "historical" area for older quilts too, where they hang and display antique quilts that were made by the guild member's family members and I love that area even though some of the oldest quilts are pretty damaged. So far the biggest quilt show I have been to is the PQIF in Santa Clara and those were more on the 'professional' side, I think, although there were quilts there that were "easy" enough I could probably make them. And some I will probably never, ever be skilled enough to make.
Personally, I have never yet met a quilt I did not like in some fashion or another. Easy, hard, simple, complicated, modern, antique...I love them all.