I think that someone claiming to be a card carrying socialist one one hand, yet is lainly terrified that his children should associate with Vivien from the Young Ones-esque oiks is asking to be mocked, frankly.
It pisses me off no end that a large number of people immediately dismiss what they class as 'sink' schools with absolutely no idea of what they are like in reality.
DD goes to what you would class a 'sink' school, basically a bog standard comp in an area with selective grammars. She didn't take the 11+ as she moved into the area during year 9 (from a selective school in a neighbouring town, which in reality despite the wonderful GCSE grades was a crap schol pastorally). She was unable to get into any of the selective grammars due to huge waiting lists.
So, she went to a comp. Yes there is a large proportion of unmotivated kids, however the school emphatically does not cater to teh lowest common denominator (such a fear re comps I find) and has given dd a far wider ranger education than her previous selective school. The quality of teachers is in general better (not as many coasting teachers as there were in the selective school, generally teachers who choose to teach in sink schools seem to have a more vocational bent). The discipline is far better.
DD has just started Year 10, she is predicted to get As and Bs in all 10 of her GCSEs (not bad for a dyslexic kid) and is far happier than a lot of her friends who have remained in the supposedly better selective school that her old friends still go to.