I think it's moreso a lesson that if you're going to do it, you can't half ass it. Everything Drake has done has been cleverly calculated, and he picked a great beat. And just like Nas, Pac, and Hov he had a variety of quotables in his diss. I'm not comparing Back To Back to Ether, in fact I don't think Back To Back is a great diss. But there are like 3 lines in there that BITE. Whereas Meek came back with a diss so sonically unappealing and barely coherent that it became forgettable. At the end he has has a dope line about Diddy but then the diss ends. As I said earlier, it feels like a mixtape record.
Meek came up battling people in Philly, which is why I not only assumed Drake wouldn't directly diss him, but that Meek would respond with a bomb. I think a lot of people thought the same thing. Now it's pretty much over.
Another thing this tells me: Kendrick v Drake would have been very interesting. I think Kendrick would destroy Drake lyrically, and pick the right beat. But this week has shown Drake's dominance of the mainstream is probably something we've never seen in hip hop before. Dude could literally just call Kendrick short and clown his voice over a dope beat, landing no blows, and still be hailed king.