While you may have a seemingly well-organized navigation that just needs finessing, your site architecture is the foundation of the entire website experience. Do you really want to build on something that could be cracking at the base?
You have 15 seconds to make an impact when people visit your site. If your website is not user friendly, you will lose more than 20 sales in the time it takes you to read this post. Is that a gamble you’re willing to take?