Boring by definition means "not interesting, tedious". If that isn't somehow disparagement when applied as critique of a photo, well, I don't understand English as well as I ought.
The first shot you posed as possibly boring, of the ocean .. Sugimoto did an entire exhibition of photos like that at the De Young Museum some years back. Far from boring, they were breath-taking .. they instilled a feeling of space, isolation, calm, pent up energy.... lots of emotions.
The second shot you posed as possibly boring is a fine abstract, with geometric nuances leading to a number of emotional responses.
Boring to me would be looking at a series of sunsets, one after another, taken on the same beach on the same day at nearly the same time. That would be tedious and uninteresting to me ... but might be part of another person's abstract effort to convey an emotional feeling or response through the very tedious repetitiveness of it. What gives me the right to call that person's efforts boring, in essence to disparage the effort?
Boring to me is also the photos I shoot to retain muscle memory, because they are of random things with no intent behind the shot other than to keep my fingers and eye moving. They might be perfectly framed and focused, well-exposed photos, but without any intent or emotion to convey they are, by my definition, "not interesting, tedious." They might, however, convey something to someone else looking on that I don't see. Are they still boring?
Lumping things into a category called boring is, to me, very judgmental and suggests a good deal of prejudice in critique. Judging a show with other judges, we can often laugh about the number of "old men with wrinkled hands" and "barbed wire against gnarled wood" photo submissions there might be, which implies "boring", but never mean it seriously if we want to do an honest job of judging and helping photographers recognize the flaws ... and strengths ... of their photographs. I think it is important to get photographers (and myself) to articulate their intent, which generally speaking removes the disparagement of "boring" and replaces it with "successful" or "unsuccessful" in their photographs.
G
"To see, we must learn to open our eyes. And then—open our minds."