> for new users it's a miserably difficult product to learn, especially for any kind of casual use.
.. means the UX is bad. Just because it's an advanced tool doesn't mean it needs to be unreasonably difficult to wrap your head around. Pixelmator isn't as powerful, but the UX for most of what it does far exceeds Photoshop's similar features.
Discoverability != usability. Products designed for casual, first-time users must be discoverable (= it's easy to figure out how to do things), while tools for professionals repeating a workflow over and over must be usable (= fast to do what you want). Photoshop is usable but not discoverable, Gmail has to be both and it's a fine line to walk.
.. means the UX is bad. Just because it's an advanced tool doesn't mean it needs to be unreasonably difficult to wrap your head around. Pixelmator isn't as powerful, but the UX for most of what it does far exceeds Photoshop's similar features.