Playing A K to raise in front of you

Ace King...How powerful is it?? You see it everywhere, a player gets Ace King and he is "ALL IN". Is that really the right play? When it comes to Texas Hold 'em, the correct answer seems to always be...that depends.
Depends on chip stack, position, stacks at the table, players style, how close you are to the money. Mike "the mouth" Matasow stated in an interview that if there is a raise and a call in front of him, he folds AK everythime. Last I checked, Mr. Matasow has more bracelets and has won more $$ than me so maybe he is on to something...
Just something to ponder. See you at the felt.