you've only been on the site for a short while I imagine. But ya, there have been several attempts in the past. overall i'de say a half dozen.

The main problem with them is orcs are more one dimensional than other character options for 40k. So everyone ends up playing more or less the same personality. The randomly violent comic relief. the usual pattern is that it starts off fairly entertaining but dies quickly as most people are doing the same things just describing it in slightly different ways.