I think people are sleeping on Atletico Madrid this season, they have a solid squad and a great coach, they could make a deep run in the UCL, especially if they can get their defense clicking properly.
It's not that many people don't pay attention, but most people still think that a team like Atletico Madrid is still mentally inferior when competing in the Champions League because there are many teams that have the mentality to win the Champions League. In addition, Atletico Madrid will also face Real Madrid, who are generally still strong in the Champions League every season, so this will still be a serious obstacle for Atletico Madrid this season.
I think Atletico Madrid was unlucky in terms of fixtures. They were paired with one of the teams that can be considered the favorites of the Champions League. Therefore, there is a high probability that they will be eliminated early. However, we should not forget that Atletico Madrid is a strong team and has the power to compete head to head with Barcelona. They can also make things difficult for Real Madrid. This is the Champions League and any result is possible.