Do you have LR, if so, import them, then whizz through them in the Library, allocating a one star rating to those that you think are half decent, then change the sort order to rating and delete (yes delete) all the zero star images.
The repeat being more critical, giving a decent image two stars, repeat the delete for the one star images)
Start 'developing', if you think an image has potential give it 3 stars, and so on
If you are being critical, I'd be surprised if you end up with more than one 5 star image (that's not meant in a bad way, its just that very few of us actually shoot images that we really like!!), but you'll have some 4 star images. These two ratings are your keepers.