I'll go first! - Minolta Z1. It was absolutely crap. Noisy images at any ISO. Looked crap too. Nothing good to say about this camera - Fuji XPro 1. Might be controversial but I had it for a short time, when it first came out. When you got an in-focus image, the results were superb. Had quite an ethereal look to photographs captured by this camera but therein lies the problem. It would never focus correctly. Apparently some firmware update fixed it but at that point I was done with it and swapped it for a Leica M6, which was brilliant and had no trouble focusing. - Wisner Technical Field Camera. A wooden 4x5 (sorry, it's 4x5 not 5x4!) made by Ron Wisner, an apparently dodgy bloke who eventually bought a boat and disappeared with a load of customers money, so I understand. My problem with the Wisner was even with the bag/wide angle bellows, I still couldn't get a 90mm lens to focus on it. I had the front bed rolled right back as far as it'd go and it still wouldn't focus. Might have been me but I hated that camera. Bought a Toyo camera soon after to replace it, which was brilliant.