There may not be much difference between most pitching coaches in the majors, but that doesn't mean that they don't have a big impact on a pitching staff. A bad pitching coach can ruin pitching staffs, and individual pitchers who need good coaching.
The Reds have had a history of bad coaching, of not being able to develop talent, mostly due to the team's willingness to only sign affordable coaches. While Price may not be exceptional, the fact that he is qualified and competent marks a clear improvement for this organization.