Anytime you raise this kind of question, it ends up being very difficult to quantify. Because, every fan base has dick fans. Including Michigan.
I have never had problems and always heard good things with fans from Iowa, Nebraska, Purdue, Wisconsin, Indiana, Minnesota, ND, or Northwestern.
Illinois fans are jerks, and hate Michigan. MSU fans can also be jerks. And PSU fans are delusional. EDIT: I forgot that Rutgers does not seem very likable either. I know nothing about Maryland.
However, OSU is in a class by itself. It seems like some of the OSU faithful have an over the top hatred and obsession with Michigan that is just bizarre, especially given your domination over thew last few years. Call me a chicken, but I really am not sure I would go to a game in Columbus. I mean, I have relatives who went to OSU who are great. But there are some fans there who just take it to another level. I like that Michigan and OSU want to beat each other terribly, that they will play their rival to the utmost. But I want there to be respect. I don't like cheap shots, and trying to hurt someone else. And that includes fans picking fights with fans from other schools, and pouring beer on them, spitting at them, etc., etc., etc. It never is called for.
EDIT: So, I want Michigan to beat OSU more than anyone else. After that, I want Michigan to beat MSU and ND, and then PSU. I despise that Michigan has lost to OSU way too much. And want that to change. But I still respect OSU as a great team, with a history of great teams, and great coaches. I want to dominate OSU. But I don't hate you. It is difficult for me to articulate this appropriately. In the big scheme of things, I hate MSU, and really dislike some other schools. OSU? The Buckeyes are Michigan's greatest rival, and will always be their greatest rival. The model for me is Woody's relationship with Bo. They fought each other tooth and nail, but they respected each other, and were friends at the end of the day.
FINAL Edit: I really dislike more of the teams in the SEC and ACC, and a few in the Big 12 and even Pac 10. The cheating, the bag men, the complete lack of any concern for academics, is on a whole different level. I mean, even though I'm a Michigan grad, and think the world of my school, I have a lot of respect for many of the schools in the Big 10. Less so in the SEC and some of the others.
TL;DR: Summary: I respect OSU, desperately want Michigan to beat OSU, but don't "hate" OSU. PSU and others? An afterthought.