Did the Brusilov Offensive did well?

Yes, it did it's one of the most Sucessful Offensives in Military History and Brusilov is known for the "Father Brusilov" as his Nickname to his great victory. The Germans did Take some Troops out from Vurdun the Germans did Counterattacked Casualties were Sooo high on the Austro Hungarian Empire it is Estimated about

Casualties 1,200,000 - 1,300,000 Central Powers

Casualties on the Russian 1,000,000 - 900,000