We went to Benidorm for ten days, three years ago. Believe me, I am not the type of person who would jump at the chance to go there, but...
...it was great! Admittedly it suits a family with youngish kids and parts of it can resemble a zoo, but we chose a half-decent hotel on the outskirts, near to a couple of the mega theme animal/water/thrill parks, flights (Alicante) are easy, plentiful and dirt cheap even in mid-school holiday time, beer was 1€ a pint and food was cheap too. The old town is really nice with quaint little tapas places to wander between (the kids didn't allow the grownups much tapas y cerverza time, though).
And let's face it, there can't be too many more Brits in Benidorm in August as there typically are in Fethiye.
If Benidorm is too loud then I'd have a look at Moraira or Altea a bit further down the coast.
Saying all that, I'd still go to Turkey every single holiday if it was up to me.