We've seen both ends of the spectrum. The outgoing coach (for what we believe were personal/political reasons) gave one of the top players on our team a very poor assessment on a D1 questionnaire. Parents were so frustrated that they pulled him out of the school and moved him to another state. He just received a verbal offer from a very good D1 program -- thankfully, he did not suffer long-term harm, but he could have had he stayed.
The probable incoming coach (a former D1 catcher) has been amazingly pro-active in helping players get to the next level. He has not even been officially hired at our school, but he came to see our son play a summer select game, paid personally to have lunch with my husband to discuss our son's strengths/weaknesses/goals, and personally arranged for my husband and son to meet 2 baseball players from a college son is interested in. The meeting lasted 2 hours and was invaluable. Just this morning, he worked son out for 2 hours and plans to do the same next week. We feel confident that when recruiting efforts heat up, he will be standing ready to help in whatever way possible. We are so thankful and realize that the support that he offers is very rare....