Unlined chimney?

What if anything do you guys say about gas appliances being vented into an unlined brick chimney flue?

The chimney should be lined. The brick looks to be distressed, I would recommend a level II chimney inspection by a Certified Chimney Sweep.

Mark i also inform them of condensation , leaks Carbon monoxide and so on. it should be lined.

Thanks guys, you both confirmed my thoughts, I just wanted to make sure I was correct before calling it out.