First, we all should atleast want them to start 13-0. This would give us the oppurtunity to give them their 1st loss in what would be our "superbowl". Pathetic, yes, but heck, when you're a bad team, this is part of the package.
Now, i actually don't want the jets to beat the pats, assuming they are 13-0 in that game. I believe the pats may have one loss in them and would much rather see that come in the post season.
Lets consider this scenario: if the pats finish the season undefeated, even if they don't lose in the post season, we can atleast appreciate the fact that we saw a team go undefeated. I don't know about you people but in my 22 years of watching football, i've always wanted to see a team go undefeated.
On the other hand, consider this scenario: Let's say the pats finish the regular season 15-1 and go on to win the superbowl. Then, all we're getting is to see the Pats win another title and where is the value in that for us?
Conclusion, if you want some semblance of happiness, root for the Pats to finish the regular season undefeated.