Morale has the universal acclaim, so it was well received... And like Charlamagne said, Mr Morale is actually Kendrick's most praised album after TPAB outside of rap music, which is clearly what he was targeting.
I personally don't see him being overrated because the praise he got from the media, is nowhere near as high as the praise he gets from people that have strong musical knowledge, lecturers, goat musicians and shyt like that, you know people that actually know music on a more technical level. Now the thing with Kendrick, as opposed to Nas, is that he doesn't really make his music just by himself. There's like 60/100 musicians all working on his albums. Same for Kanye's first 4/5 albums.
Kendrick is the dude we talk about the most within the rap community when discussion his music, but in other music communities, all his collaborators get as much praise as he gets. I've never seen that with a rapper like Nas, because at the end of the day Nas is mostly rapping over some beats, there's no real complex musical idea to catch on his records. That's not a critique though, he's great at what he does.
Edit: "The idea that DAMN would be considered the 2nd greatest anything is hilarious" Can give me a reason why? cuz as far as I'm concerned, I could also say that I can't name a single album better than this one and my comment would be just as valid as yours. How are you judging it? whats the metric?