Husband said the same thing...that I can change the resolution.
The thing is, I like the default smaller fonts, smaller icons, wider screen, etc. It's really done well. The thing is, the photos now appear much larger. The PDF's at my usual 117% just looks extra big. Reducing it to 100% is still pretty big but I can manage...I may down it a notch to 75%. Not a big deal, just different. I may have to play around with the PDF software. As for photos, I doubt I can do anything about it. I'm not going to download other people's photos just to make them smaller for my view. Kidding.
Overall, I'm actually very happy with Mavericks. It's speedy.