Think about all the crap he went through in the game... and how he soldiered on regardless. Wimp? Don't be ridiculous. Sure he complained and protested about it, but he kept fighting anyway.
Compare his amount of “complaining” to that of Snake in the original MGS.
Anyway, I felt that Quinton Flynn (Isaaru in FFX)’s acting was just fine. Believeable, fluent, captured the emotions well.
But then, it seems customary to despise any translation of any Japanese game, so there’s probably not much else I can add – except that some Japanese voice-actos are pretty poor, too. In the trailers for MGS1, the Ninja sounds like a robot from a bad 60s sci-fi, and most of the other characters have nearly identical voices – except for Liquid and Raven, who’re distinguished by the fact that Liquid’s voice is about an octave deeper than Raven’s.
Not everybody’s going to like every actor. Big whoop. Like him or not, think he was suited to it or not, it’s hard to deny that Flynn gave a skilled performance as Raiden.