Greetings K ellis and for me personally if I know the new diver I do not hesitate to ask a few questions. If I know the instructor well enough I will ask him a few as well.
What irony that you pose this question as this type of situation just took place a few weekend ago. I learned that there are many different levels of conservative dive planning and new diver assessment.
I have seen new divers that are very capable of doing this dive with a experienced diver one on one. It is my personal belief that it takes really knowing the skill levels and comfort levels of your dive buddies and more importantly YOUR SELF!
I feel honest appraisal is a necessity and as others have mentioned greatly lacking in some areas. How many "experienced" divers have you seen that needed to revisit OW training in particular buoyancy control.
At the end of the day once you have spoken your mind respectfully it is their choice to do what ever dive they wish. Your conscious is clear end of story.
Dive safe and have fun!
CamG Keep diving....keep training....Keep learning!
Thanks CAM I guess I am just one who takes safety extremely serious. I think I was just afraid I was going to witness a fatality from lack of air but in the end everything went well