The main problem with Reddit is the users dishonesty to themselves. Ask a reddit user why they like reddit they'll probably mumble something about AMAs. Then visit /r/all and a completely different picture will be painted for you as the sites most popular content is a mixture of pornography, racist jokes passed off as being subversive and political ranting.
There is... like, less than 10% matches what you describe
and a AmA is in 10th position with near 5000 points