It’s interesting that most experiences are related to a single architect or firm of… but then the phrase “most of them…” is used.
Being an Architect is tough and most people have no idea what the role involves. Unfortunately most architects aren’t very good at explaining their services either. It is a profession and most act with the highest professional standards.
If you are unhappy with the performance of an architect you can always complain to the ARB. As a profession that has a protected title members can be struck off for misconduct or negligence.
Perhaps some of the horror stories are not from architects at all, many people claim to be architects without having qualifications. You should check on http://search.arb.org.uk/