OP,

if you had a root canal therapy performed on a tooth 10 years ago and it made it this long before having any symptoms then you are average.

[link to en.wikipedia.org]

Nothing lasts forever, especially dentistry.

Feel free to badmouth dentistry but I will have to point out that the decay in your mouth was not the result of the action of any dentist. And if a root canal was necessary, obviously the decay or trauma was extensive.

Grow up and take responsibility for the consequences of your own actions and quit looking for a scapegoat.