Right, always easy to see the good sides of other systems, but much harder to anticipate their failure modes. Besides the one you mention (of politicians being

Right, always easy to see the good sides of other systems, but much harder to anticipate their failure modes. Besides the one you mention (of politicians being pawns of a party boss -- they owe their local seat only to their place on his list) proportional systems also have a habit of handing undue power to small, often extreme, parties when they have a tie-breaking vote.