Here are some of my posts that I wrote regarding Rav Ovadia and his "halachic activism".
Rav Ovadia's basic mistake.
Lo Adoni, on Urim v'Tumim, and Rav Ovadia's mistake.
On the superficiality of Rav Ovadia's thinking, Marc Shapiro.
On Rav Ovadia's activism, Aryeh Deri.
About Rav Ovadia, without mentioning his name:
On Oslo, Rav Ya'akov Yosef.
On the Gadol HaDor.