Take this for what it's worth but a nifty professor at Emory University took a look at NFL teams and crunched some numbers and ranked the fanbases of the teams from first to worst.
BEST:
1. Cowboys
2. Patriots
3. Eagles
4. Giants
5. Steelers
WORST
28. Bengals
29. Jaguars
30. Titans
31. Rams
32. Chiefs
Well, the Vikings didn't make either list. Nor did the Packers. I'm just happy the Packers didn't show up on the Best list!
Source: CBS Sports