I am a retired FE lecturer who attended the local state primary and local comprehensive before going on to university.
Both my children attended the local bilingual state schools and went on to university after gaining 10 A grade GCSEs and 3 As at A level. They both got first class honours degrees and my daughter went on to get an MA and then a PhD. They are both employed in fulfilling work.
So educationally the state sytem seems to have served them well, but, importantly, they did it with their feet kept firmly on the ground, and with a good grounding in what it means to be part of a community and a real "big society".