The actor who starred as the schoolboy wizard in eight films from the age of 11, but has since moved on to more serious roles, said he was blessed to have landed the part.
However, Radcliffe, who made about £60 million from the popular role, said: "The moments I'm not as proud of, mistakes other actors get to make in rehearsal rooms or at drama school, are all on film for everyone to see."
The actor singled out Harry Potter And The Half-Blood Prince for criticism.
He said: "I never liked watching myself on film. It's hard to watch a film like Harry Potter And The Half-Blood Prince, because I'm just not very good in it.
"I hate it. My acting is very one-note and I can see I got complacent and what I was trying to do just didn't come across."