Well it took Guardiola quite some many years to be able to win the Champions League despite he having one of the best teams in the world when it comes to great players,he always had great names but it took him several years in order to harmonize this team even in European competitions so all kudos to him,for me though any other coach would have won at least once the Champions League with these players in his disposal,just my opinion.I do believe Guardiola to be one of the best coaches out there but I think it took him a lot of time to win a Champions League trophy with all these great players,nevertheless the Champions are never judged so let's see the next upcoming season.
Guardiola is a very skilled coach and Manchester City is a very strong team. The combination of a skilled coach and a strong team has taken a long time for Manchester City to win the Champions League trophy. If a team like Manchester City has to work so hard, the Champions League trophy is like a dream for other teams. But Guardiola has proven that hard work and focus on one's goals and self-belief make any difficult task easier.
Guardiola is not the best manager after seeing Manchester City win the Champions League trophy, he is already the best manager because his style of play is completely different.
I don't agree if you say Guardiola is not the best manager, previously he had won many trophies with Barcelona in various competitions which made him win his first treble as a manager. His success continued throughout his career in the Bundesliga, with Bayern Munich he was also able to prove his quality.
After successfully bringing Manchester City to the first treble in the history of the club, Guardiola became a coach who was able to win 2x trebles, Guardiola success in winning 2x trebles may be difficult for other coaches to achieve for the next few seasons. Manchester City is trying to maintain the success that has just been achieved, they are trying to add strength to their squad to face the challenges next season.
I said that those who think that Guardiola winning ucl trophy for manchester city is a good coach are wrong because even before he won champions league trophy with manchester city he was an experienced and quite capable coach. There are many who consider Guardiola to be among the best with Manchester City's Champions League trophy. But if he could not win the Champions League trophy this season, would he be an incompetent coach? This is not the case at all. LAs you said he won several trophies for Barcelona. He has also had some notable success with Bayan Munich and has always been a great coach.