You have not understood my comment about the meter you need to read thread from the beginning.The meter needle in the viewfinder could not be read in dull light. It could on other makes of camera.The Nikon photomic head had a small hole at the top that did not let in enough light.It was so bad that Nikon made a device that screwed onto the eye piece and went over the top of the photomic head with a light in it to illuminate the needle in the viewfinder so the needle in the viewfinder could be read.it needed to be attached in all but bight lighting conditions.Nikon corrected this problem by using LED's in the F2AS.They had tried to correct it with the F2SB in 1977 but it was a failure because the LED's could not be read unless the eye was exactly in the correct position.
As for the flash having to carry an adapter that was not even a hot shoe(when many other cameras had them) around then fit it and have to take the flash and adapter off to rewind the film and reload another film was crazy.
As far as point number 3 is concerned it is not a case of"Anyone who needed to use a cable release would've PROBABLY just bought an adapter/Nikon cable release" it WAS a case that the had to buy the adapter and carry it around like it or not.
That's before one gets into all the messing around with AI and none AI lenses and having to make sure that you spun the aperture ring from one end to the other to make sure it coupled with the pin on the photomic head! On other manufacturers you just put the lens on and took photos.
The F2 was worst camera I ever owned :banghead:. I fell for all the hype and the fact the the press used them.I did not find out until years later the Nikon used to give them the cameras.I am not surprised they gave them away.
So to answer the original posters question"What makes one SLR any better than another" I have given the glaring example of the dysfunctions of the Nikon F2.
The things that make one SLR "better" than another is the way they operate and do the job they are supposed to do(are you listening Nikon).
The way in which a lens mounts can be a factor.The Canon FD range of lenses had a suspect mount as they could be misaligned easy causing damage ( I had FD it never happened to me but I was always cautious as know those who did damage).Yet the Olympus OM range had a superb lens mount with a nice big plat base plate making it easy and fats to mount.If the OM1 had used LED's in the viewfinder it would have been my perfect film camera(see below).
Another factor was the position of the shutter speed control, most cameras had it on the top right near the shutter release that required the removal of the finger from the shutter button to alter the shutter speed.Unless there was a readout in the viewfinder it was just about impossible to know what speed you were shooting at.However the Nikkormat and the Olympus moved the shutter speed control to a large ring around the lens mount area.That way there was no requirement for the finger to be removed from the shutter in order to alter the shutter speed and you had a good idea of the shutter speed in use due to the position of the ring. Altering the aperture, focusing and shutter speed was all done with the left hand. Brilliant!
So it is things like those that make one SLR better than another NOT a vacuum back( I just want a toy and not a camera) that runs the battery down in no time (Contax gimmick) or needing to carry three different adapters to take a flash,see the meter readout in the viewfinder or use a cable release and the blasted thing used to cost £400 in 1980.