Believing him as a human being and when he plays villains
Don't get me wrong I'm not criticizing Jeremy Irons or his acting in any way. It's just a matter of having seen The Lion King, then later in Die Hard with a Vengeance. Those were the first movies I saw starring him, and in that order. Seeing Die Hard with a Vengeance I can't help but think of him as an over-the-top cartoon villain in human form. Since then I can't help but find him more funny than evil when he plays villains.