With some research, I found that I do have a good reason for the dislike. In fact, the leadoff walk scores between 22 and 34 percent of the time, on average, per MLB season.

How often does a runner on third with no outs score?

That's plate appearances with a runner on third and less than two out that result in the runner on third scoring. These days, it's somewhere around 50%. Where has it been before?

How often does a runner on second with no outs score?

With no outs, the runner on second base scored on a single 39% of the time over the last ten years. But, when there was 1 out, the baserunner scored 51% of the time. And with 2 outs, that runner scored 76% of the time.