@Stehsegler: sorry, I might have overgeneralized a little:
beaches facing towards north tend to collect more rubbish than others, and obviously Ftelia seems to be worst in this respect, but holidaymakers can clearly expect to find beaches that don't leave anything to be desired. Given that Yuppy is from Victoria, he might even be a Pookipa regular and would be relieved to find fantastic water quality in comparison.
@Lucdown: you were clearly very lucky to score one of the windiest summers ever last year, which oddly as well sported comfortable water temperatures. Last August I only had a handful of days on which I used the 6.4 or couldn't be bothered to do so, teaching my kids to sail instead. The remainder of the four weeks I spent there, I used anything from 3.8 to 5.6. So, yes, it's worth a visit.
In other very windy years, water was only a little over 20, while in years with not enough high pressure over the Balkans the island can be in the lulls for a fortnight or so with many other days you can sail further south and despair at the lagoon. You would then at least be rewarded with water so warm it won't cool you down.