Maybe three stars is a little unfair as it did block many links when clicking on the search result, but didn't block them from the search itself. Unfortunately like so many others it didn't block the search result, and prevent my searches been taken over by Pinterest.
I far as I'm concerned, Pinterest is far worse than many add sites and should be treated as such.
I'd change browsers without a second thought if they claimed to block Pinterest.
Even if it was owned by Google.:-)