Responding to Jung's post above, I agree ballplayers tend to swing at bad pitches in tense situations.
Howard is certainly not a very smart hitter. It's incredible the Phillies are paying him a fortune to hit .260.
You pay Pujols, but you don't pay a hitter like Howard.
The statistics people downplay batting average these days in deference to OBP and OPS. But Batting average is a measure of how good a hitter a guy is--not how good he is at forcing a walk. What happens when the ball hits the bat, and how often.
Having seen Ted Williams at bat many times, I will tell you that he had tremendous plate discipline.
He swung only at strikes--regardless of the situation, and got lots of intentional walks. As a result his OBP was huge. As was Babe Ruth's and Barry Bond's--for the same reasons. Is a walk a measure of how good a hitter a guy is? No. It's a measure of how good a batting eye he has. What he does when the ball hits the bat is another story, though his chances are much better if he swings only at strikes--as Williams so aptly showed in his book on hitting. "Get a good pitch to hit", but you got to know what is a good pitch.
Mantle, by the way, disagreed with Ted's philosophy. He was up there swinging for the fences every pitch--so he said. The situation dictated what he did. Ted never concerned himself with the situation.