If I'm not mistaken Arsenal last won become EPL champion in 2003-2004 and of course Arsenal fans are really hoping that Arsenal will be champions in the coming season, let's just see what happens later and whether Arteta will succeed in bringing Arsenal to become champions next season or not.
Well, the last time they won the Premier League was in that season, namely in the 2003-04 season. And that, I think, was Arsenal's heyday. because in that season Arsenal never lost even once. So that season is called The Invincibles. 
All fans definitely want Arsenal to be as successful as they were in those days. At that time Arsenal was still coached by Arsène Wenger. And it seems that Arsenal has not been able to return to its glory days. But I believe they will be able to return to those times. Even though we don't know when. But looking at Arsenal's strength, they actually deserve to be champions. They just lack consistency.