I went to the Northwestern class -- one in the evening -- and only about three women brought partners. And, if I'm being honest, I have to say I resented all of them (although a lot of it was due to being cranky and uncomfortable in general!). I felt self-conscious doing holds in front of the guys for some reason. Again, I attribute a lot of that to general crankiness (as it turns out my son had already dropped and I gave birth just a few weeks later -- one month early!)
There's not a lot for the husbands to do, and they do look bored and uncomfortable at the bare breast movies, but if you want your hubby there for support, he won't be alone!
As far as breastfeeding in general, the premature birth and the fact that my breasts just don't produce much milk combined to keep my son underweight for 4 1/2 months while I desperately tried to keep breastfeeding despite all the challenges. I did get a great lactation consult at my pediatrician, but it just didn't work well for me, and I was scared to stop trying because of all the research that makes you feel like a bad mother if you use formula. If I could do it over, I would have tried for maybe a month, and then, if it didn't work, I would have enjoyed my son and stopped revolving our lives around his feedings and my pumping. So the moral of the story is: breastfeeding is great when it works, but don't stress yourself out if it doesn't!