I've been to one game at Kinnick that didn't involve ISU. It was vs. Purdue in 2004 and had some hype going in. I was ready to leave at halftime, and it had nothing to do with doofus Hawkeye fans. It's just boring to sit for 4 hours for a game you don't have a rooting interest in.
I've tailgated in Iowa City plenty of times. Always had a good time, but doubt I ever return, and if I did, I would definitely not wear Cyclone gear. It's lame, but that's their thing. Being obnoxious is something they are proud of/think is funny/cool.