Having said all that. there are people who don't care about it and there are basements that people wouldn't step a foot in if you paid them to.
*The most important thing is to ask yourself if there is room in the house that makes up for the lack of basement. Some place to exercise, storage, rec room, is the crawl gravel or concrete? etc....
But most of the time, if a buyer asks for a basement, we search only for houses with basements. It take a creative agent to think outside the box and be able to point out other areas in the house to use "as a basement".
If you are concerned, I would be happy to give you my opinion after evaluating your home in person.
You may visit my website and read a little about my history and Bio if you would like.