It depends on a lot a of things, like the blinds, what action has already occurred.

If he just goes all-in cold, chance are he has crap, and a call with AKs and QQ and maybe even AQ could be +ev in the right conditions.

Generally I dont' like calling all-ins with less than KK though. If you don't have any money in the pot, and your stack is comfortable, there really is no reason to gamble. If there are antes, it makes it more tempting to play.