I think it depends on the story and the tone. If it's a version who has a tradition of bad Shakespeare, then he should have that unless there's a story reason (like in Worldengine for him to talk otherwise. If it's Red Norville, maybe it should even be worse. But, if it's a construction worker or nurse from New York looking like Thor, they should talk like they talk, unless they're doing a voice or there is some other story-based reason.
Movie-Thor wouldn't have had a chance to be so charming if he was thee and thouing it as extremely as traditional Marvel Thor.