I've found over *many* years of experience (too many.....) that the most pleasing results from a polariser are when the sun is at a particular height in the sky - in UK that tends to be about 2 or 3 hours after sunrise or before sunset. (not applicable in winter)
Closer to sunrise or sunset it gives less pleasing results and I would tend to use one less then.
I'm not sure if that is related to what you are suggesting, Hoppy?[/QUOTE]
I'm just responding to comments that you can't use a polariser with a super-wide or that the results will automatically be poor. Because it's simply not true - just one of those myths that gets propagated on the web.
It's about the angle of the sun, direction of the camera, degree of filter rotation, how stongly polarised the sky is, clouds and other subjects in the frame etc. Lots of variables. (For the benefit of others - I know you know this Jerry

)
My rule with landscapes is quite simple -
always give the polariser a try, and it will
always do something, somewhere in the image. Sometimes a lot, sometimes a little, but usually good.
Here's an example using a super-wide at 10mm (Canon 10-22mm). The sun is directly overhead, therefore the band of polarisation runs evenly right around the horizon 360 degrees and on a superwide looks a bit like a grad effect but without any darkening of the white church. It also shows just how dark the sky can go with a polariser when it's really clear blue.