I did a biology past paper the other day. On some one the questions I was confident on I was getting 4/7, 1/3 etc. due to missing out stupid points (some of which weren't even relevant to the question). However, a question on cystic fibrosis came up which I hadn't revised and could remember barely anything about. I just wrote down some key phrases that came to mind and got 6/6 on it.
So yeah, I don't think exams are too easy, I just think they need sorting out.