In order to make clear what a weak hole is, I think it might be helpful to define a strong one.
A strong hole (according to the redhead) offers every golfer at least a few options.
It rewards each well-executed and appropriate choice.
It offers new options on each swing, even when the prior stroke or its execution was poor.
It offers the highest reward to those who have thought out and executed the best long-range planning from tee to green.
Finally, and perhaps most importantly, it does all this while at the same time being aesthetically pleasing, interesting to play repeatedly, and with no incongruent details to call one's mind away from the moment.
When I watch a movie or play, I enjoy the suspension of disbelief . . . the feeling that I am experiencing what is happening on stage or on the screen, the sense that it is possible. Those are the entertainments that make me cry, or laugh, or think.
That experience is ruined when I am jerked out of my mental and emotional participation by something that doesn't fit . . . a piece of music that hadn't been written yet being used in a period piece, for example. Henry the VIII never heard Bach, and synthesizers are as out of place in "Titus Andronicus" as a '69 corvette is in a movie set in the '50's. Shudder.
I feel the same way about a golf hole. No matter how intelligent the choices, how interesting the architecture, how clever the green, I cannot like it if there are discordant notes that jerk me out of the golfer's reverie.
A beautiful and enormous tree I saw recently right in the middle of a narrow fairway 50 yards out from the tee comes to mind. A drainage ditch made up to look like a creek running diagonally across a fairway to follow the cart track and parallel the next fairway was another example. As I said in an earlier post, it didn't look like a hazard, it looked like an accident. If I pause to think, "Why in the world would they put that there?" my golf is interrupted, my peace is destroyed, and I'm irritated for the rest of the time spent on that hole.
So, to me, a weak hole is more than one that simply doesn't interest, challenge, make think, etceteras. It can do all those things well, but still be weak if it is not perfectly in tune with itself.