"or even Arnold Schwarzenegger. They all have one thing in common: their acting sucks!"
Oh, you just broke my heart! Arnold is one of my all-time favs! OK, I must admit, he isn't the greatest actor, but I love the flicks!
Anyway, from what I understand, Steven Seagal's Aikido is real. Last I was aware of, he operates two schools, one in CA and the other in Japan. And those who have had the opportunity to train with him (as has been stated) can tell you that he knows what he is doing.
We need to be careful in judging someone's ability by what Hollywood portrays.