For all the people saying he was successful before, yeh, in the Portuguese league. Many teams in that division would struggle to get results in the championship. If Amorim had proven himself with a few clubs, maybe a different league, people would have some justification in defending him. But, as far as we know, just like ETH, maybe he was just lucky to have had a good squad available and things clicked leading to some success. It's an altogether different challenge in the PL, one he might not be good enough to adjust to.
Some managers only ever work out at smaller clubs, plenty examples of this, Emery for example, couldn't handle pressure and demands at Arsenal, but at Villa, who are never really competing for the league, he's found his level and having a bit of success.