Fulham are not yet mathematically relegated from the premier league and there is no problem at all with Arsenal performance because Arsenal is now a proper mid table team and its time to accept that. The draw means that Arsenal could miss out on an European spot next season; but with the shouts as regards the european super league; they might not need a league position.
Maybe Fulham is not mathematically down yet, but it is obvious that they are a "bad" team, no team at the relegation zone could be a good team which means Arsenal should win these type of games, they are fighting for european cups right now, United will probably get it at Europa but Arsenal is trying their best as well, this type of results show that they are not good at what they are doing at all.
I feel like they just gave up at this point, this is a lost season for them and they are not going to win anything, won't go to europe next year, not win the fa cup, not win the europa cup, basically all zero season by the looks of it. That is a very bad season by Arsenal standards, I mean sure they are not a team that won anything in the recent years, but they were at least doing better than this, they weren't always this far away from everything.