I like GIMP
I'm not a pro nor will I ever be but I've used GIMP regularly for quite a few years. It has its flaws and foibles but the fact that it is free and powerful is more than enough for me. I greatly prefer it over Paint.net and the cost of Photoshop has always been a no-starter for me. Adobe and Corel have their own UI quirks that turn me off so obviously user perceptions about what's good and what's bad are going to be different. I encourage anyone who hasn't used GIMP or hasn't used it in the past two years to give it another go when 2.10 is released. It may not replace a commercial product for your daily use but if you become familiar with it then you know there's always a free backup available if the need arises.