I'd say Jack Nicholson and Arnold Schwarzenegger were much more famous names in Hollywood, at the time they were cast for their respective roles.
I completely agree, and, in my opinion, both did pretty badly. As I've said in another thread, Jack Nichlson played Jack Nicholson instead of The Joker, as he was cast. Arnold did much of the same, really.
1) I was referring to the franchise. That includes Burton and Schumacher. I'm not. I'm talking about Batman 3, in this series. I agree with you on the old series, however, and it apparently did well for it. This is a different time, a different genre, and almost a different set of characters, when speaking of interpretation.
2) I noted fame and elite class of actors. So if they're not famous, then more than likely they're highly known names within the "filmgoing and acting community".