Hansi flick is a good coach and you can’t hate him. because how can a coach be doing well and still don’t like is performance. Last season games will probably make you like Barcelona coach because he as do well and build the team very well and they are still doing well in any matches they play against any clubs. Hansi flick mission this season is the get the opportunity to win the champions league this season, since he as failed against inter Milan last time they have improved there self and get some new players that will help them do better in all the competition. Let wait if flick will be the favorite to win the UCL, but I know that he will always difficult for them get the chance to win because they have some tough club that are chasing the title too. And no club will like to give up easily in the competition.
You're right he's a coach that has been successful even before he came to Barcelona then came to the league and won it with Barca on his first season I don't think any football lover would hate such a coach he's the type that a fan of a big team that's not doing very well would love if their team signs him cause he'll make changes immediately he arrives.