It's hard not to be sentimental about the Kohl Center - I love going to hockey games, I love how awesome the atmosphere is when it's full and the band is going nuts and I love the Badgers.
But the building itself - can kind of be a pain in the butt. I mean, it's not really any better or worse than any other big stadium I've been too, but it does have its quirks.
If I'm being nitpicky, for non-students, the parking situation is atrocious. There are inexplicable railings in the 300 level that pretty much block my whole view while sitting down, making me think no one actually USED the seats before they finished the whole thing off. I don't think there's any rhyme or reason as to where the restrooms are put (sometimes I can pass two or three men's rooms before finding the ladies room), the sensors on the sinks in the restroom NEVER work, the placement of some of the concessions lead to serious concourse traffic jams and the cement stairs are kind of treacherous in the winter months.
But the atmosphere always more than makes up for those things and you don't really notice them, so there's that.