Think the Messi slander is pretty extreme, in the first half he was easily Barca's best player but faded as the game went out of reach, which is obviously on the defence
Messi in general finds himself with Barca's results being treated as a proxy for his performances. Happens to big name players everywhere, which is great for getting RTs at full time but is also not very sensible
Yeah he definitely wasn't trying in the 2nd half, which is fair to criticise him for, but only really up to a certain point since it's fairly inconsequential when you're 4 goals down. Plus the support in attack was also just not there for most of the game