At a glance, I'd be unclear on what set of scenarios they expect the site to help out with. The person would need to type the right search term and hopefully land on the right result. If they wanted to use the navigation, it seems hovering over the menu items doesn't show you the structure of the site-- you need to click into each individual tab. It's pretty but hard to gauge how useful it is.
Totally! I think the search term issue will get addressed as the datasets get tagged with more near and similar terms so it populates the search results with a wider net of results. (like misspellings, synonyms, topic and category terms, etc).
I feel like we talked about topics being a search result too, but there was some barrier to the search tool to get it to work with other page types. That'd fix a lot too.
