I challenge you to read what I wrote again, no one is praising Arsene Wenger for his achievements in Arsenal, though he deserves the praise. I was only referring to the long-term rivalry that the stay of him and Sir Alex Ferguson made happen at that time. And if you must know, Arsene Wenger was not a total failure in Arsenal, he won 17 trophies for the club as the manager, which includes 7 FA cups and 3 premier leagues. His last moments were challenging but can't completely erase what he has achieved.
Maybe you are discussing about last seasons in Arsenal of Arsene Wenger. His career in Arsenal has many years and if you only look at his last years there, with lot of disappointments, yeah he made others very disappointed. However if you look at his whole career or early and golden years in Arsenal, he is deserved to be recognized as one of most successful coaches in Arsenal and in Premier League.
Before the appearance of Arsene Wenger, Arsenal was not in big club list of Premier League. With Wenger, they got improvements in finance and in sport results. They won some Premier League with Wenger and even got to a Champions League final. It is true to show respect to Wenger with his long career in Arsenal and what he did for them.
It is true that the Premier League is still halfway through. The season is still long for Arsenal to win the League this season, because Arsenal could be beaten in important matches.
The season is long but with success so far, Arsenal has a good foundation for rest of season. They are strong, get a first position with 5 points more than Manchester City which is a nearest opponent and they got a solid belief after all that they are strong and competitive enough to fight for the trophy.
Arsenal coach Mikel Arteta must really focus during the international break, because this will make the players competing in The World Cup will be exhausted, after the World Cup ends, if Arsenal don't take care of the players physically then it will be detrimental to them when the league starts again, of course the stamina of the players must be really fit like the beginning of the season, if that is not done then Arsenal will find it difficult to maintain their points at the top of the Premier League standings...
What happens in World Cup and a few weeks after that, not only in Arsenal but also in other clubs, will be very important for Premier League race in general. Arteta should focus on his plans for his team only. They should prepare to fight against opponents with their best resources. They can not think of plans that Arsenal have best resources but opponents have worse resources as consequences of World Cup. It is an unrealistic plan.