Its always fun to go back along the forums and read the titles of "Minn Easiest Lock!", "Saints Auto Win", "Pitts Will Crush Oakland".
There are a few routes to take.
1) Second guess EVERYONE.
2) Second guess the lunatics who guarantee.
3) Take the high road and don't second guess.
I'll be honest, I take the 2nd route. If someone says "Pitts -7 guaranteed lock - bet the house" then I'm going to bust this guy's chops. Its fun and he deserves it.
Otherwise, if they are just expressing opinions mildly, try not to bust people