Those are reality TV shows, not documentaries. There's a whole buttload of that crap on Netflix, every single cable channel, and all over YouTube.
I watch a lot of docs, so if you are interested, here's a quick list (no people bitching at each other though, you might not like it) :
In the Garden of Sounds - Amazing blind teacher helps kids.
ESPN 30 for 30 series - some great sports stories
A Matter of Taste - interesting chef spotlight over many years.
A Man Named Pearl - awesome story about a black guy that neighbors complained didn't keep up his yard, so now his yard is like a King's topiary garden.
Exit Through the Gift Shop - graffiti doc
Triage - see what a true caring doctor can do
Life in a Day - Clips from thousands sent in from around the world, showing a full day in pieces from various people's lives.
Under Our Skin - about Lyme disease; saved my life
The Civilian Conservation Core - PBS special; very good.
Most should be on Netflix.