That being said, I wouldn't go as far as to say it's bad.
As far as downsides go, I'll be the first to say that I'm not the biggest fan of ArtRage's interface. That being said, I wouldn't go as far as to say it's bad. Aesthetically, it feels off to me, but I can chalk that up to years of muscle memory with programs like Photoshop and Illustrator. It's still worth mentioning, though, as other folks may have similar issues.