I was reading the thread discussing DOF preview buttons, and it gave me an idea for another, somewhat related but more general discussion.
What would be your vote for the most over rated feature in a camera?
To me it would be the instant return mirror found in virtually all modern SLR cameras.
My first serious camera was an Exakta VX iia, and at first I found the black out when firing a shot somewhat disconcerting. However, after I got used to the idea I came to rely on it as a kind of feature. Basically, the last thing my eye would see prior to the blackout would be sort of imprinted in my mind and would be pretty close to the actual shot. When I got a more modern camera with an instant return mirror I was at first I liked it, but then I noticed that I was less able to visualize the shot at the instant of taking than when I had the old Exakta.
Now, I have obtained some Kiev 60 cameras, and the advantages of the mirror blackout seem to be coming back to me, along with the idea that the instant return mirror is an over rated feature.
Oh, one more thing: another advantage of the non-instant return mirror is that it is very easy to tell if the film needs to be wound to the next shot.