I'm 6'1" and the way I like my seat had the top of my head grazing the roof. Without the sunroof, I've got and inch or two. Yes, it depends on how you sit, but I'm not willing to compromise my comfort and back just so I can have a useless hole in my roof.
Plus there are different kinds of "tall". If your height is all legs, it may not affect you whereas if you're a friggin giant all around, it may.
It's most certainly a case by case situation. In mine, the sunroof simply wasn't an option.