Before you immediately assume failure (because of his mediocore test record) think about it.
The guy has scored 134 first class centuries, on the brink of 40'000 runs and still playing great at 41 years old. Would it be unfair to call someone who has acheived this a failure?
And how do people think he would have done say if he was brought into the England set up now as a young 25 year old now, was his failure down to his inablility to handle pressure or bad management of the day. As I think it would be true to to say England debuants perform much better today then say 10 years ago.