Macworld:

Photos for OS X is designed to appeal to a broad audience, with simple editing tools that let anyone improve their photographs. But is that it? Even though it’s a 1.0 product (replacing iPhoto and Aperture), a lot of editing power is actually hidden beneath that user-friendly surface.

I’m a happy Lightroom user and won’t touch Photos for OS X with a ten foot pole but this article does a good job of explaining what kind of editing you can expect to find in the app.