Atalanta really play well against Arsenal. I don't know what's wrong with Arsenal they need to put more strength in their games. The Champions League is not a league where some clubs perform well and have opportunities to win games. Arsenal should have lost all points if Atalanta had not missed the penalty. However, Arsenal's lack of effort may have been due to their upcoming match against Manchester City this weekend. It's just that Arteta was lucky to have a superior keeper; else, they should have lost the match.
Manchester City and Arsenal have lost two point in the ucl, i no Manchester City are coming back stronger in there next game in the ucl because they won't try to lose there next game anymore Guadiola is a good coach so he no what he will do in there next match is mor focusing on the league match against arsenal. Arteta need to look for win that match but if they fail and Guadiola defeat arsenal I don't think the trophy can be for Arteta anymore.
There is nothing wrong with Arsenal at all. You are talking as if it was super easy to beat Atalanta in their home stadium, but the truth is that it is damn hard. In particular when they are having a good day and can play their best game. Atalanta, as has been said before here, is the winner of the Europa League last season and let me remind you that they beat Leverkusen 3-0 in that Europa League final!
They could have won the game against Arsenal with a little more luck. In my opinion they are a tough opponent and they can execute a very strategic and patient game and they can bring on a lot of pressure that makes it hard for Arsenal to play their extremely offensive tactics. I think the draw is a fair result without the idea that Arsenal played a horrible game.