Just my experience at the game, I was in section 242 and all the Bills fans (minus a few F bombs for the horrid play on the field) were pretty well-behaved. The worst of the bunch was this caucasian wanna-be gang banger, drunk out of his mind, who needed to remind everyone how much of a "sh!!-town" Buffalo was and how great his Jets were. This was around children. He left in the third quarter. Some guy from Ottawa may have dumped a full coke on him as he was exciting...could have been anyone.
The two other worse people were this couple of COWBOY FANS who didn't even face the play, just spent the whole game drinking and trying to start things with fans. They were escorted out by security early in the 4th.
I had a great time at the games, I'd bring my kids too. Why? Because as some posters have said, the camaderie you get with fellow Bills fans is amazing. I loved chatting football with Bills fans before, during, and after the game. Sure, there are some serious louts, but I find they are few and far between.