I've never used one myself but I have read very few positive reviews of Okuma, and none from people chasing big, strong fish. Mark Berg continually reminds us every second sentence in his fishing DVDs that the Okumas are super tough though.
Mind you, 25 years ago, I still remember a lot of people dishing out on Shimano and Daiwa for being "Jap crap" and that if you wanted quality, you needed to buy an American reel like a Penn.