Is there an antonym for "improved"? If not, can we invent one?

Google just “improved” the Google News page so that it’s much harder to read, less fun, more confusing, and requires more scrolling.

They have been “improving” their search algorithm so that it either gives you links to pages full of links that lead to other pages full of links that seem to regress forever, or lists of the top eCommerce sites that use Google checkout, even if you are looking for info and not a store where you can buy the thing you searched for.

Many of us here on Fluther are refugees from other social Q&A sites that “improved” their user interface to the point it was too boring to keep us there any longer.

And yet, when I search for an antonym for “improved” I really don’t find any word that clicks. Is it just that the search spiders have “improved” their algorithms to the point I can’t find what I should be able to just think of if my mind hadn’t been “improved” by aging? Or is there no perfect word? And if there is none, what can we come up with to name this important, emerging phenomenon? Clearly, it needs a name.