Cameras I disliked? The "OM-D EM can't remember" it was that uncomfortable, would come high on my list, as would the Fuij FinePix S2 Pro (better with a modified grip but still lacking). Pentax ME Super, some good ideas but the execution wasn't up to the vision, I inherited one but my choice had been the OM System.None of them were so bad that I hated them but equally I didn't hang on to them long either. I came to distrust the OM system, the OM1 had a weakness in the film advance mechanism, the Winders had a problem with the battery latch, the OM4 had a power issue and all the lenses had a potential problem with the stop screw (supposed to stop the lens from turning too far on mounting, if the screw fell out the lens would turn too far and damage the stop down mechanism). Great cameras but flawed, didn't stop me from using them for 10 years. If I had to go back to film I might consider OMs but only if I could have the accessories too.