I agree. We don't have the same old Atletico Madrid anymore. That Atletico Madrid which obtained bigger achievements could have played much more effectively against Inter in the first leg too. But we just watched a desperate team trying to secure a draw at worst. We are likely to not see Griezmann in the rematch which is another bad news for Simeone. 
Inter are an amazing team this season. They are scoring so many goals and conceding really few number of goals on one hand. While they are in a much better condition it isn't easy for Simeone to keep up with Inzaghi's team easily. Inter should be able to move on in the Champions League.
Don’t underestimate Atlético, Simione is trying to change the team, I see that he has moved away from the usual strategy when the team plays from defense, and perhaps he is right, because if we analyze the strongest teams that dominate now, they are attacking teams. But for Simione this is something new, which he probably still needs to learn. despite this, I believe that nothing is lost for Atletico yet, they have a chance to win against Inter, although I understand that this will definitely not be an easy match.Inter are an amazing team this season. They are scoring so many goals and conceding really few number of goals on one hand. While they are in a much better condition it isn't easy for Simeone to keep up with Inzaghi's team easily. Inter should be able to move on in the Champions League.