Can the Unity3D Game Engine Compete With Other Engines?

I stumbled upon a question on Quora not too long ago asking “is the Unity 3D game engine as good as other engines?” I thought the question was kind of entertaining, to say the least, but then I stewed on it for a couple of days. Some of the answers seemed to imply that Unity isn’t as feature-rich. That it can’t compete, and that if you want to make a AAA quality game you’d best look elsewhere.