Not difficult to use at all – iAnnotate - Annotate your Pictures and Photos Review
I don't understand all the negative reviews regarding intuitive use: the controls and operation seem pretty straightforward. In fact if you understand Photoshop, this should be a piece of cake to use.
I do wish the developer would stay up to date with Facebook's posting protocol: the textual comment makes it to FB but not the image. This isn't critical since emailing of the image to my gmail account works fine; it's just annoying.
Review by DesignatedDriver on
iAnnotate - Annotate your Pictures and Photos.