Ok, don't attack me with what 'successful career' is. Because - 32 titles,1 GS,5 Masters,1 YER as No.1 + 4 more GS finals is one prestigous career.
But, when you think he didn't have a lots of weapons. His serve is def. in top 10 ever, power forehand was much better before 2005. Even with all power he had, both his serve and forehand were quite predictable when player figured it.
I give him fighting spirit. Except for Roger, he pretty much owned everyone else in his generation.
Still, it's quite mystery how he managed to win so much with tehnically not great shots.