On a good day with my rangefinder I'll find that maybe 18 out of a roll of 24 are technically good, and maybe 6-8 are what I'd call good. On a good day I can shoot a few rolls like that. On a bad day, well, nothing works. Even if the right things are in focus, and have no motion blur and... and..., well, the shots all turn out as "blah" or worse. Maybe 1 or 2 shots worth looking at - but, really, no. And trust me, on a bad day, the more rolls I shoot the worse things are.
Now, if I could tell before shooting that it was going to be a bad day then I'd just go to the pub or something. And if I knew it were a good day I'd shoot off a lot of rolls of film. But I can't tell. Some days my eye is in, and on others it just isn't.
I guess part of that is my (or your) own standards for "good". I took my Hexar RF and 35mm M-Hexanon along to the company Christmas party this year. I thought I did, well, OK in the shots I took. 3 rolls of BW400CN and maybe 4-5 shots I really liked. So, obviously, it wasn't one of my "good" days as defined above. But almost everyone at the office went on about how good the photos were, and how they stood out from the other shots taken on the night. Many asked for prints (which I was glad to provide).
I think I feel good about that. However, I think that really these were snapshots in the true sense - the content of the photos certainly, to my mind, seemed to trump their technical and aesthetic qualities. And that's fair enough, too. That's what snapshots are for. I like to think that (after all the time, effort and thought I've put in) I can generally take a superior sort of snapshot. But as to really good photos - occasionally I have a day as described above where I can take quite a few I regard as "good". "Really good" eludes me, mostly, and when it happens it seems more a case of luck and working the odds. I figure the more often I can take a "good" photo the more likely it is that Luck will smile and that one of 'em might just happen to be "really good".
...Mike