Both of Monaco vs Barcelona and Atlanta vs arsenal are not a huge surprise as many people are portraying it. Atlanta were the Europa league champions beating last season Bundesliga winner Leverkusen. Monaco too is a second team in french league last season. Both of Atlanta and Monaco were playing at home. Manchester City vs Inter Milan was much surprising for me. But its first round of league and there are plenty of matches to be played.
The results obtained by Manchester City vs Inter Milan in the Champions League this season are reasonable and not very surprising if we look at their respective strengths this season and last season both were also teams that won their respective domestic leagues. But the result of the Monaco vs Barcelona match surprised me a little because before the match started I thought that Barcelona would definitely be able to win over Monaco, but in reality Barcelona had to lose in the match, even though Barcelona's strength was not that bad this season.