If anyone has real reason to feel aggrieved it is Tim Dalton - 5 years of carrying the torch without a film, with a studio pressuring him to resign. And he has maintained a dignified silence about it all.
Yeah, Dalton got screwed and he still maintained a dignified response to any Bond questions. I've never heard of him slamming anyone, even though he would have some grounds to.
I can understand why Pierce is upset - it's not like his Bond failed at the box office! He was let go at the height of his career as Bond (at least in terms of the box office numbers), and that's really got to hurt. If I did what most people thought was a great job for my company and the results were very profitable and THEN got fired? I'd be pissed. I'd probably shoot my mouth off big time - but, then again, I'm not Bond, James Bond.
As difficult as it may be, Pierce should just keep his comments short and professional, something like, "I enjoyed my time as Bond, and I wish I could have done another Bond movie, but the producers chose to go in another direction. I thought I could have done a great job moving in that direction, but they had different ideas and decided to make a change. I wish Daniel Craig well."
Now if he'd just stick to a comment like that and keep his anger to himself for at least a couple years he would come off much better.