Poch got the same out of them as Tuchel did.
To me it says more about the players than either of the managers. Loads of horribly over paid players playing in a crap league with little or no challenge or motivation.
They know they don't have to try to win most of the games, when you have that attitude it seeps down to every aspect of the team, in training, match preparation etc. I know they got to the semis but you could see in the CL games that they lack leadership on the pitch, Neymar just does what he wants, the midfield is very poor and lacks balance. Then most senior players are Navas, Veratti, Neymar, Di Maria, Gueye and Herrera, not one of these is a commanding figure or a leader.
That's why players like Tiago Silva are important, they help keep all that in check in training and around the team and during games. Chelsea had the same sort of problem when Lampard, Terry and Drogba left. Standards drop and it's hard for any manager to get a group like that going consistently again.