Well, I must confess I don't see too many merits in FTP. It satisfies majority criteria, but so does every other voting system. It fails Condorcet tests, and tests on binary independence and clone tests. The only "problem" with PR (except for the complexity of the count, but that only matters to those conducting the count) is that it it leads to fragmentation - which of course isn't a failure of the method (it does what it says on the box), but rather a political aesthetic.