I like the build, but I think agree that you need more survivability or you'll just die repeatedly in team fights regardless of where the true focus is. And yes, the random bit was awful.

I find this build too standard for my liking, and the lack of survivability (frozen mallet) in this build kind of disappoints me. And the idea of rushing a stinger isn't really viable in the higher ELO's (just think about a fast attacking Kayle with no damage) I've seen a lot of new players automatically go for this build, but I've seen them fail miserably as well. And the random bit was unneeded.

However, if you added a bit more structure, and elaborated more on the "team fight portion" I think I'd give this guide a + 1, because who hasn't seen a Master Yi just jump into a fight like he's a god? We need more details, and a more situational build diagram (since about 80% of people just look at the top of the page) but other than that, you got down the basics, but I think it could be improved a whole lot more.