My choice for worst website is the Pine-sol website. The first problem is that it takes too long to load since there are so many choices. If this is your first time trying to use their website and you need something from the, it would be infuriating. So many links, mixed with the absurdly bright colors would give me a headache in a matter of seconds of actually trying to navigate that website. The other issue I had with the site was that you have to scroll in both directions, a lot, to see much of the opening site. An introductory webpage should be one page where the user can easily identify the link they need to zero-in on what they actually need. Overall, a seizure in waiting.
http://www.pinesol.com/#/explorer/