Settlers of Catan is practically M.U.L.E. refined. You start by buying land, then the land bears resources. When you sell to other players, you can ask any price you want. You build up by laying down roads, towns and cities, tech up with random development cards. The most common dice result - 7 - is the Thief, which lets the current player rob any other for half of their resources rounded down.
If you liked M.U.L.E., you will love Settlers of Catan.
Just a small correction. The Robber(or Thief) in Catan doesn't allow you to steal half another player's resources, you just steal one card. However, if any player has 8 or more resource cards in their hands when '7' is rolled, they need to discard half rounded down.
If you liked M.U.L.E., you will love Settlers of Catan.