If you think he's corny it would have driven you mad to grow up in the area, because everyone is (or used to be) exactly the way he describes them.
That monotone is Minnesota. Just a bunch of really hard working people who like to drink (a lot), don't want anyone to make a fuss over them and will help you shovel your sidewalk, finish your basement or put a new roof on your garage. You don't even have to ask. Just start doing some kind of work and when you glance to your side, there they are with a hammer or a shovel. Don't say "thanks" though, because that would embarrass them.
I know, it sounds fake, but it was really like that where I grew up.
His weekly shows in St. Paul are sold out two years in advance because everyone there recognizes themselves or their family in his humor. He's been doing the show live for what, 25, 30 years? You'd think they would have to give tickets away, or bus old people in from the suburbs. But last time I was up there I tried to get tickets for that week's show and they just laughed at me (politely, of course). He did the show for a year or two from an old theater in the building I lived in, and every Sunday it was a mob scene on the block. Like the president was in town or something.
Of course it was downtown St. Paul. Didn't take much to generate excitement down there in those days. It was usually a ghost town on the weekends.