Do you think he could give a brilliant performance if he was given a decent script?

Not sure. Haven't see him act in about 30 years.

yaa I think he could pull that off and given an outstanding performance. However as a major reintroduction to Hollywood I dont think it'd be a good image move to start off as a creepy villain

I don't even know why I'm coming up with this... but if there was a Kid Rock's biography movie to come out, I think he'd fit right in the role and I'm sure he could put up a believable performance.

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Creepy Villain? Like the Good Son?

He's fun to watch on Red Letter Media, I think he could pull it off, not as a lead but a zany sidekick perhaps.

Yes.

His character in Saved is pretty great. He's very funny and fully believable in that role. Also this sketch he did not too long ago is a look at his currentish chops. I think he's great:

https://youtu.be/yh7-wAy_8ss

I don't think he's interested in acting really anymore.

I could be wrong and someone correct me but wasn't he offered the Sheldon role in The Big Bang Theory and turned it down? Maybe he didn't want to do a sitcom, but I have got to think he's being offered at least smaller roles in big productions.