I was playing a freeroll on pokerstars with a 3k pricepool and 650 participants. 15 minutes in was I with startstack and an aggressive player went all-in with a 4BB shorter stack than me. I call pre-flop with QQ he has A9 and he hits the Ace on the river.
I checked the hand-analysis afterwards and saw that I will win 3 of 4 times. But is it worth the risk in a such a good tournament??
I think you must be realistic when calling an all-in. chances are someone will have AA, or KK; do you really want to run into a brickwall with your QQ? More likely though, the person that is raising you would be on a draw (like AK or AJ). But in reality, you just don't know. So I try to stay away from calling someone else's raise all-in with any pocket pair less than KK. I'll also call, sometimes, with AK, or AQ, but in general i'm not the type of player who likes getting all my chips in before the flop. Even calling with KK preflop has gotten me into a lot of trouble.
Now please note that there is a difference between CALLING and all-in and INITIATING an ALL-IN from late position. I think it is more acceptable to go all in with QQ from late position if YOU are the one intiating the raise (i.e. everyone else has folded or called and you are last or near last to make a betting decision). In that case, people have already made a public comment about their cards: that their cards were not good enough to go all-in with preflop. Of course, there are those who slow play their high pocket pairs when there is an aggressive player at the table so you must be careful with this.
In general, I don't like putting all my chips in before the flop. However, if I am deepstacked and calling an all-in with QQ woudl not take me out of the tournament should it not go my way, then I would probably call the all-in. Those are risks I like taking because they can increase my stack size significantly if I do prevail in the hand and if I don't, well then I will just have taken a hard hit chipwise but NOT be taken out of the tournament altogether.
Your number one goal should be to survive the tournament. calling an all-in and risking your tournament survival doesn't make sense for QQ, and barely makes sense for KK. In fact, there are so many hands that can beat AA that I'm not so sure itw ould be a wise move to regularly do with AA.
If cashing in the tournament is what you are after, then you should find better places that QQ preflop to go all in; for me it is too risky in most cases...