The idea that a photo is substandard if people like it, well if people like it, how can it be substandard? I think many times people who are technically-minded look at things like a minor tilt of the horizon, or a slight bit of blurring as making a photo substandard, when in reality the vast majority of people have an entirely different way of determining what is a good photo. The other day a friend of mine had some photos printed, and one was a photo of a young woman with pearly white teeth, and her entire face was covered in deep dark brown mud, and there was a very slight, and I mean very slight, as in almost imperceptible degree of shutter speed blurring or subject motion blur. I personally felt that the very slight blurring actually_added to_ the sense of verisimilitude, but in one sense one could downgrade the photo.
it's like the famous blurry Beach D-Day Landing photo attributed to Capra, which by the standards of any self-respecting 1940s photojournalist, was a really crappy photo, looking much more blurry than most people would consider acceptable, resembling a 1966 Ernst Haas 1/5 second sailboat photo in the degree of blurriness.
A lot of what many photographers might consider "substandard" is in the realm of snapshot photography, or vernacular photography as some call it, quite good. I think a photo has to be evaluated not based upon its technical merit, but based on its emotional or visceral impact. One of the most memorable photos I have _ever seen_ I saw about 40 years ago, or actually more. It was in a Time Life Book in their famous l?Library of Photography series. The photo was made in the early 1900s and was a photo taken by an ankle-mounted camera that was smuggled in to an early electric chair execution. The photographer pulled up his pant leg and took one shot, presumably because his camera only had one shot. The photo was grainy and blurry and somewhat underexposed, and yet I can still remember it. I saw the photo when I was in 6 or 7th grade and I am now almost 57 years old! The photo I am talking about would be considered quite substandard even by the time in which it was shot, in which most photographs were made on glass plates or on large pieces of the then-new thing called film. The photo was low in resolution back in the days when many cameras were 5 x 7 in or even 8 x 10 in, and when the vast majority of photos were quite Sharp if one looks at the old glass plate scenic's shot in that time on a website such as shorpy.com, it will be clear that the execution photo which I saw many years ago was "substandard" by many different metrics.
Underexposed, blurry, and poor in technical quality, and yet a photo that I can almost to this day see in my mind's eye about 45 years later. Substandard in most every way and yet Unforgettable.