Sorry about the bad experience with Photoshop on the iPad.
This is the beginning. The first version of Photoshop on iPad is focused on compositing, basic retouching, and masking, common tasks and workflows that we know will be useful for most Photoshop users. Over time, we’ll add more capabilities and workflows as we learn more about how customers use Photoshop on a mobile device.
We’re releasing with a set of features we know all Photoshop users will need and plan to add capabilities as we see how customers use Ps on the iPad. While leveraging the same code base helps accelerate development, we’re also deeply committed to rethinking every experience for the pencil and touch screen to give you the best Photoshop experience possible no matter what environment you work in. We know we have more work to do and we encourage you to share what’s important to you after you’ve tried the product.
It is called Photoshop. It's been the long standing gold standard for photography image editing. I have zero problems with an app that suits illustrators but it shouldn't be called Photoshop. It's unusable.