Not at all. Unity is the engine I use, these engines are immensely valuable to developers like me, I can't invest years into building my own stable core right now, and although it has its rough edges and problems, it suits my projects very well. Builds to all sorts of targets, too. For my latest project I'm using the FMOD middleware for positional 3D audio. On the graphical asset side of things, I paint everything in Photoshop, and animate it in the amazing animation software Spine (which has an open source Unity runtime).