Atlanta too was not bad but Real Madrid currently is the best team in Europe. Real Madrid was the European champion even without Mbappe and with Mbappe, they'll have much more power at forward. It was a pleasant start for Mbappe. Girona and Barcelona are at their downfall and this season, the trophy looks easy for Real Madrid. A lack of competition too can be monotonous. This year too English premier league would be the most competitive and interesting league followed by maybe Bundesliga. France and Spain seem to have larger dominance of single team while Italian league is failing to attract good players.
If Atalanta's opponent was not Real Madrid, I think they would have played much better and would have been able to score goals. But unfortunately they had to face Real Madrid who have very good strength, not only in La Liga but for the European level they are undoubtedly very strong, so it is very natural when Atalanta lost in this match. Overall Atalanta's game is still good, it's just not easy to face a team that is at a different level than them. I don't mean to underestimate Atalanta and think their level is low, but with the naked eye we can judge for ourselves from the composition of the players owned by Real Madrid. Apart from that, the strategy implemented by Ancelotti is also good.