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1) low two pair hands are easy mucks. as acesover8 points out, he flopped two sets and got very lucky to win the pot. Multiway they are bad hands since they will rarely make the nuts. If one of the pairs is above ten, this is a different story. You then have a decent chance of flopping the top set, which is the most playable of the three sets. Also this way, if you flop a boat, then you can get a person to draw nearly dead if the flop comes J 5 5 and you have pocket jacks to their AA53.

2) Three of a kind is an automuck, AAAx is playable only under very slim conditions. Omaha is one of the only games where more cards in your hand can hurt you.

3) Four straights are definetly hands to crack aces with. If you are heads up on the flop, then just call if you flop two pair. You know he will go all in with aces, so you wait till the turn to push to make sure that the third card on the board doesnt pair. If he will go all in at any time regardless of what falls, you should gain as much information about the final board as you can. If the third card pairs, then you can easily drop or check your two pair.