What? Serenity wasn't a good movie?
I thought Serenity was great, and I liked his work with most of Buffy and Angel as well. I also read somewhere that he was an assistant director or something on Thor. Those credentials are enough to give me faith...
I'm sure I'm way in the minority on a site like this, but I watched the Firefly series because a buddy insisted that I do so, and outside of Nathan Fillion being his usual funny self, I thought it was horrible. And Kenneth Branagh directed Thor, Joss Whedon directed the cut-scene after the credits that was the Avenger's tie-in. He had quite literally nothing to do with Thor's success.
Sorry to be the nay-sayer here, but Joss Whedon's work today just hassn't done anything for me at all.
So why does Hulk need a third actor for this movie? I assume the first 2 of those movies sucked so bad they didn't want to be in this super hero party movie?
From what I read Edward Norton wasn't getting along with someone (no idea who) and they just decided to not use him again. He was allegedly up for reprising the roll.