Height is important, but if you're at least at the lower end of average then it's not that big of a deal. It only starts to matter when you are noticeably short. Women are extremely picky about men's looks, but height, like Norwood rating, is a disqualifier rather than a qualifier.
Height to Norwood conversion table (in the United States):
6'0 ~ NW0
5'9 ~ NW1
5'8 ~ NW2
5'7 ~ NW3
5'6.5 ~ NW4
5'6 ~ NW5
5'5.5 ~ NW6
5'5 ~ NW7
Height to Norwood conversion table (in the United States):
6'0 ~ NW0
5'9 ~ NW1
5'8 ~ NW2
5'7 ~ NW3
5'6.5 ~ NW4
5'6 ~ NW5
5'5.5 ~ NW6
5'5 ~ NW7