I recently got an account and am playing with the WordPress Cloudinary library. Cloudinary looks appealing and has several nicer features than WP's built-in library, but your image-cropping functionality seems essentially useless. I understand that, when cropping, you can set the "gravity" (I assume this is roughly which part of the image will be considered center) and adjust the pixel height and/or width, but trying to guess how many pixels from some vague area of an image I want to crop to is impossible. And if I brought the image into an image editor on my computer to measure the pixels, I might as well save a cropped version there and upload it.
Why don't you have the cropping functionality that is so common (user draws a square on an image, can resize the square, can click to crop the image to that square)? That would be much more usable.