All depends on the type of tournament here. Donkeys go all-in that early in freerolls or small buy-in events when the blinds are low when they have the following hands:
A-10 through A-K
Small to medium pocket pairs (2s-10s)
I had this situation come up a few weeks ago in a small bounty tournament on the very first hand of the tourney - monkey first to act shoves all-in, and I have pocket 10s. Most posters, I'm guessing, would fold here...I happen to think that's the wrong play in this type of tournament, however.
Look, the worst thing you're looking at is opponent has JJ or QQ - you can almost certainly rule out KK or AA here. Most likely, you're either ahead in a coinflip, or your pair is a 4-1 favorite over a smaller pair. In order to go deep in any MTT tournament, you're more than likely going to have to win a few hands like this in a row, anyways.
We've been taught from reading numerous poker books
and sites that you have push your edges when you have them - why wouldn't we do this here? Sure, you might go busto on the first hand of the tournament, but winning the hand gives you that much more of an edge to go deep into the tourney, instead of merely limping into the money.