Arsenal failed to win the Premier League because they could not maintain their consistency. I think the reason is that they don't really have the proper preparation and they don't have a lot of options to rotate players, so fatigue and injury became a big problem for them. Besides that, Arsenal also don't really have a winning mentality, one important thing that their rival (Man City) has.
Arteta certainly wants to make Arsenal even better this season, but I think it won't be easy for Arsenal to become champions because apart from Man City, Liverpool and Man United will also have the same target.
Many times last season Arsenal came from behind to win their games. There were times when they were even two goals down yet they still found a way to win. Arsenal of last season had a winning mentality. They played each game like their lives depends on it till they started dropping points due to injury and fatigue.
If they succeed in getting quality players to add to their squad they would be a powerful force next season.
Only Man City and Liverpool are the threat Arsenal face next season. Arsenal and Newcastle will have a better season than Manchester United.
I had a look at most of the games and it wasn't that noticeable how often Arsenal turned around games. It was a couple of times but nothing out of the ordinary. I think it was an average number of games, but if you have a more convincing statistic I would like to get a ling and have a look.
Arsenal has played a great season and there issue wasn't in the beginning or the middle of the season when they struggled for a few games but got back into shape immediately. There main problem was towards the end of the season when the mental strength that they have shown in so many games out of a sudden was gone. They didn't score at the right time anymore and they couldn't convert their chances with the same efficiency anymore. Something was different and Manchester City knew how to exploit that weakness. But I am looking forward to the new Arsenal this season as I think they can again create some exciting action at the top of the table.