Nope.
Lost one to the Bears in '86 (46-10 thanks to the Bears storming defense.)
Lost another to the Packers in '97 (35-21. Favre at his best.)
Lost two the the Giants. (One of which ruined the chances of a perfect season. And in both, Eli at his best.)
That makes 4 total.
Guess math isn't your forte, huh?
Wanna break it down even further? In eight Super Bowls the Pats have been outscored with a combined total of 189 to 166.
The team I root for isn't important. (I'm not a Steelers fan, by the way.) Win, lose, or draw, I still root for 'em.
Whereas you weren't going on and on like this when the Giants beat your guys, so, again, I'll say that you probably aren't a fan unless the Patriots are winning.
(PS, the Steelers fans still have bragging rights - 'cause, you know - 6-2 is still better than 4-4.)