I've not owned one myself but have a student that has 2. I absolutely adore them. Very willing, quiet - not once have I seen either buck, spook, blow up but they are VERY food motivated. She's a little rider and it took a bit of work at first, particularly with the older mare to end the "ooh, there's a blade of grass" duck and snatch. Both are very smart/easily trainable. They pick up quick, good and bad. I like hers enough that I do plan to buy one for my daughter eventually - eventually only because she already has 6 kid broke horses here to choose from now.
Not spending all the time with them though, I absolutely can see some of the less desirable traits discussed being possible without a shadow of a doubt.
Life is like a camera. Focus on what's important, Capture the good times, Develop from the negatives and if things don't work out, Take another shot.