I was ok with the pats winning through their first super bowl, the season after but then when they got good again their fans entirely forgot that 10 years earlier they had 15,000 season ticket holders and nobody cared. And they became insufferable - most pats fans would prefer to laugh at your team for losing than celebrate their team for winning - a very odd dynamic.
That said, they are really f'ing good and they don't get any better than brady and his evil coach. Brady's first few season was mostly dink and dunk, but he is awesome now - no getting around it. They take crappy players nobody else cares about and turn them into stars - then they leave and do nothing. (see branch, deion)