I find so many players over play Ace-King. Especially early in an MTT they will push ALL IN with Ace-King. Even a pair of 2,s has a slightly better chance of beating Ace-King and it could be the end of your tournament.And of course if you run into AA your dominated and KK you have 3 outs.
Later in the tournament when the Blinds are getting bigger it makes more sense and worthwhile to PUSH your Ace-King to steal the blinds. Also once your closer to the bubble there is less chance of being called out.
Many players PUSH the Ace-King and totally miss the flop. And when they get raised post-flop they won,t lay down the Ace-King and chase it all the way to the river. Some will chase it with there whole stack.
I like to limp in with them sometimes. But most of the time the correct play would be to raise 3-4 X BB to take out the weaker hands like small connectors, etc.