What I like the most is that it isn't a general purpose software. It is an software for artist. Made it for artist.
The default templates set is an example of that. it hast comic and textures templates and others artistic templates. The default brushes settings is enough for create stunning art, you don't need expend a lot of hours, sinking for custom brushes, but you can customize anyway.
It has a color wheel! Photoshop, what are you waiting for? I don't undestand why this tool is not developed in all artist softwares. And at last, an integrated reference panel is a great plus.
Like others art software, Krita has a not user friendly layers tool and can't reach the unbeatable photoshop layers management.
The interface can be improved. This is a general lag of open-source.
As an open-source software, they listen the communitiy and apply his demand of every release of the product. In a low-budget project, Krita is a perfect suit.