His power is okay as long as you time it right. He has gone downhill since they gimped the slice which was his best shot by a mile.
The power stat is too good in this game though as it makes up for shitty groundstroke stats. Flake and Roddick just smash everything on either way cause they have high power stats.
I time the ball well (or did when I played), but it seemed like it wasn't penetrating. Maybe I was just playing with some real sharks, but I had to rely on angles to find success with him.