Originally Posted by Handofdeath
The ability to take a walk.
If you are referring to an ability to take a walk because a hitter goes up to the plate simply looking for a walk, I probably agree. But if a high number of walks are the result of a hitter who has good plate discipline, then I couldn't disagree more. A hitter with good plate discipline is not only increasing his chances of a walk, but also his chances of making good contact because they will only swing at pitches that they have a high percentage of making good contact with. Walks are a by-product of good plate discipline in most cases and I can't see that as being a bad or overrated thing. Walks lead to baserunners who lead to runs scored.
As to the topic at hand, I would have to agree with a few other posters who mentioned a pitcher who throws heat. Throwing the ball hard, unless you can throw in the high 90s, will not be effective unless you can change speeds, put movement on the ball, and locate your pitches.