As an Agent, I will share factual data. As to my opinion, I hesitate to share it because I may color someone's view/perception/analysis of a situation. In fact, my opinion is worth less than what I am paid to share it.
The buyer does have a responsibility to complete a search and due diligence of an area or home they are considering. The buyer needs to accept responsibility and perform some leg work.
During the Buyer consultation, the Buyer advised the agent of the areas they wished to search for a new home. I ask why they selected those areas so I may offer some additional areas they may wish to search. It is not my place to tell them one area is 'better' or 'worse' than another.
This is a great question! It causes all of us to think about what we do and say.