I've heard one oi type metal band, Honor. Their half of the split with Graveland is quite ridiculous. It's not terrible music, but the vocals are horrendous, and at times, laughable.
I really have no interest in the hatecore stuff or any of the "Kill all my pals, Burn all Jews" type of stuff. I like it in the subtle way, like Arghoslent, and NSBM like Temnozor', etc. THough I can't understand a word from the non-American bands since it's all in their native tongue, which is fine with me.
I'll stick with the subtle stuff. Graveland still rules supreme.