Good questions Kahdrick. You're right, it doesn't quite have the architecture that wowhead uses to make it's information accessible, but our wiki is searchable in some limited ways. For example, while the main namespace is not searchable for item terms because almost all the items get transcluded in, you will need to perform a search specifically in the Data namespace by using the advanced search options:
As long as we're consistent with the naming on the attributes, they should be searchable if you know the terms to look for.
There are also item lists that we create for ease of comparison: Wand_List. For now it's just a compilation of items within the same class comparing basic stats. If you wanted to know which items deal fire damage for example that's a little harder, but if you think it's going to be useful you might want to create a list for that for others to use.
Finally, you can also use google to search specifically our items Data section by using the search terms:
site:www.diablowiki.com/Data:items "Fire Damage"
It's not reliable because not all the pages have been crawled by google, but that might improve over time.