My experience echos a lot of folks who've already chimed in. Having served with many, many fellow officers from each commissioning source I can honestly say no difference in Officer due to commissioning source. Plenty of Good Men & Women from each commissioning source and each source produces their fair share turds as well. No one has the market cornered on excellence or disfunction.
I will echo HAL's comment that not many of the Academy grads I knew would have done it over. I met a few who would, but most wouldn't. Most were there because it was "free" or Mom & Dad loved the idea of it way more than they did. I have several fellow officers as family members from OCS and ROTC. None of us went Academy. I went to Basketball Camp at the USAFA. All of counselors were very open about the fact they hated it there and were contemplating leaving at the end of their second year.