The meadowlands were probably the best and worst for me. Giants fans are mostly old men with their grandchildren. Very gracious and nice people. The Jets fans, on the other hand, aren't very gracious and nice people. I was wearing a Bills hat (too cold to for a jersey) and was constantly harassed. Didn't help that I sat in that idiot Fireman Ed's section, either, where the DB'ery seemed to be intensified.
I have also been to TB and Miami for road games. The TB fans there were cool but didn't seem to know much about football, but they drank like Bills fans. I couldn't believe how many empty seats there were in Miami, what a joke of a fanbase.