Scenario one: Runners on 1st and 3rd, one out. Non-power hitter A grounds to shortstop for an inning ending double play.
Scenario two: Same situation. Power hitter B hits ball in the air for an out. Runner from 3rd scores. Next hitter singles. Following hitter strikes out.
Let's say that these hitters come up 4 times in a game with the exact same scenarios. A tends to hit the ball on the ground, B tends to hit the ball in the air. Hitter B can strikeout three times and hit a homerun. Or he can strikeout twice, homer and fly out. He would drive in 3 or four runs in these cases. Plus the inning is still alive in both cases.
When I watched the Braves last year, I saw an awful lot of hitter A's. In the scenario I described, it seemed that they usually hit the ball on the ground (or struck out). Since most hitters don't hit 400, they usually did something less than 2 for 4 in those situations. But assuming that they did hit .400 they would be responsible for driving in 2 runs. Again, that's with them hitting .400
This isn't based on stat analysis. This is based upon my observation as a fan that watched a lot of games. The Braves were a station to station team. Not much speed. Not much power. Not much sucess in the scenarios that I described.
There is nothing wrong with a guy who might walk or might get a single. The odds say that it is hard to win when most of your players are that guy.