Say this a lot; but before pressing the shutter, ask WHO (is going to want to look at the picture) and WHY (will they want to look at it)
Your 'boring' landscapes probably ARE boring, to most people. But were they taken to interest most people?
Point of taking a photograph is for some-one to look at it. Why else should it exist?
As Phil says, most people are interested in people; look at the papers, look at the magazines, look on the net; MOST photo's people want to look at have other people in them; people who are interesting because they are famous or uinfamous; or doing something stupid, daft, exiting, dangerous, unusual or other wise 'interesting'.
The average viewer is not one jot interested in the subtelties of sensor resolutrion, optical clarity, exposure accuracy, or even great composition... they dont give a damn, and most cant apreciate it ANYWAY, and even those that can, probably wont get very exited about it.
These technical merits? Well, the only people that are likely to appreciate them, are other keen photographers, like yourself.
So, WHO are your photo's for? and WHY should they be interested?
'Better' is very subjective. All depends what you want to achieve, and really is measured by how well it succeeds.
Brother-in-Law's snap-shots; object of recording family doing stuff, if it does the job, could be a pretty good photo. Could be 'better' technically... but if it does the job, its a good picture.
Your Landscapes. Who is supposed to look at it? What is supposed to interest them, and does it do that job? How well does it do it?
Its nothing you should be jealous about; but the feeling of your better camera and more diligent application of craft being 'less' appreciated, is understandable... but turn it around, and what can you learn from it? WHY are his 'cruddy' snaps so much more widely appreciated than your presumed 'master-pieces'?
Who and Why. if a picture has a viewer and that viewer is interested in the picture, its a good picture.
If the viewer isn;t interested in the picture? Well, either its the wrong subject, or the wrong viewer.