[mardi59]

As lousy as Grace Jones was in Conan thr Destroyer, she still did a better job than Ahnold.

[Reily]

I disagree there.
Grace Jones did something in the movie, it wasn't acting.
If you have ever read the Robert E. Howard Conan stories Arnold's acting did fit the role. Since Conan was not a complex character playing a believable Conan is not that hard to do. Basically it requires the actor to flex, stage fight and strike heroic poises that's in Arnold's range.