Attached Link: http://http.developer.nvidia.com/GPUGems3/gpugems3_ch24.html

Always obey the #1 rule of computer graphics: whatever looks right, is right. Whatever helps you getting good looking images, use it.

Math however, is not a matter of opinion. Rendering is all math, and the mathematical necessity of gamma correction in rendering has been explained in many places (I linked one of them).

 Whether to exercise the artistic freedom of breaking the rules or not, that's up to everyone's own opinion. My favorite paintings are far from physically correct and that's what I like about them.

If, on the other hand, you're trying to get perfect photorealism, then doing the same things a photo camera does is essential. And every single digital camera on the market is converting linear luminance data to an sRGB or AdobeRGB color space in a process commonly called gamma correction.