There have been four cameras that have disappointed me, the first was a Nikon F601, it had a great metering but felt so much heavier than the Pentax Mz10 I traded for it, I hardly noticed the difference in AF speed so swapped back. In hindsight though I do not think it was that bad. The next one that disappointed was the Nikon D200 it never auto focused well with most of the lenses I had, but oddly worked perfectly with a friends lenses so they gave me cash and a D80 in exchange and everyone was happy. I then for some daft reason exchanged the Nikons (and Fuji S3) for a Canon 5d and a 1000d, I did not like it at all so after giving it enough time to get used to its different ergo I sold it all and bought a Fuji GS645s and another Nikon and a shed load of Polaroid film. I sold the last camera that I did not enjoy a Bronica ETR-s just felt far to heavy for the film size, I have a health condition that makes the weight of a camera important. So I sold it on and bought a Fuji STX1n with 55mm 1.6 and put the remaining cash towards my MA fees.
Now I could have kept the Bronica if I was using it in the studio but the project I wanted to do was urban to do with globalisation. I have overall realised I don't really get as much pleasure using auto focus cameras, so I will not bother with a film AF camera as there are just too many fantastic MF cameras to use. Besides after my wife bought me a Yashica mat I do not majorly desire to get any more unless they are a pound, money is better spent on film and paper.