Pep has an incredible record with Barcelona and Bayern Munich but considering the respective Spanish and German leagues where he has won every domestic and international club honours, the EPL would be a big challenge for him even with Man City. The EPL, unlike the Spanish league and the German league, is not a 2 horse or one horse race as what some bros have mentioned.
Therefore, my personal opinion, is that it is still early days for Pep.
Notwithstanding this and with due respect to Pelle, the announcement is somewhat unwelcome and being too disrespectful to the incumbent considering his credentials as a coach and manager of the current club he is managing and his previous records.
My take is that it is better to look inward at our own club and see who and how the mess here at Old Trafford is going to be cleaned and improved by LVG or his successor instead of looking at other clubs (though I note that is incredibly tough since everyone is making comparisons all the time).