He was a good speaker. His economic policies ended unemployment and the wage went 10% up, but there were a lot of problems that came with his policies (can't recall at the moment). Also his military decisions were horrible and his stubborness ended in him not listening to his generals. There was no way he could have won simultaneously fighting the USSR, USA and UK.
The only thing interesting in Mein Kampf is its historical value and the book itself is badly written.