A knack of drawing matches they dominated proved their undoing, struggling to break teams down when top goalscorer Zlatan Ibrahimovic was absent or stuttered.
"And I think we're going to reach that level as a football team in the next couple of years".
Speaking to Arsenal's official website after the game, Wenger said: "At some stage it didn't look like that, no". Last season, he showed glimpses of his ability at the end of the season, scoring goals and troubling opposition defences.
Mourinho does not necessarily buy into the idea that more goals are needed, just a fairer spread to help them win more matches.
United have added striker Romelu Lukaku, midfielder Nemanja Matic and defender Victor Lindelof to their squad.
Pressed on what he aspires to in the future, the 29-year-old is hoping for success for both club and country.
"We are in a position to do quality work better than we did in the first season, so I am convinced that our second season, in terms of the quality of our team, is going to be better". Nearly every top team have strengthened themselves with some wonderful signings and we are in for an absolute peach of a season.
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And things are kind of working out now, I feel like I've got a pretty good downhill plane when throwing fastballs and changeups. Jose Bautista shifted from right field into the DH role, while Ezequiel Carrera was entered into the outfield.
Leicester are winless against the North London club in their past 21 league meetings stretching back to November 1994 and Arsenal's run of 10 straight home victories over Craig Shakespeare's side is the longest for an English top-flight club at home.
Manchester City's chairman Kahldoon Al Mubarak has said that youngsters Tosin Adarabioyo, Jadon Sancho and Phil Foden will be given chances in the first team this season.
Brighton and Hove Albion - Although in my bottom three, I see this as a great opportunity for Socceroos goalkeeper Mat Ryan as he's going to be very busy.
Petr Cech, Arsenal Captain said: "I think we made technical mistakes for the second goal, it can always happen - it's part of football".
"This time, we are all in the same basket".
The Arsenal subs proved super subs as they inflicted defeat on Leicester. Ramsey scored in the 83rd minute, to restore parity at 3-3, followed by Olivier Giroud, who headed in the winning goal in the 85th minute, raising the roof at the Emirates.