The Armenia international was used as a makeweight last month in a deal that saw Alexis Sanchez head the opposite way, ending an underwhelming season-and-a-half spell at Old Trafford.
Mkhitaryan admitted upon his arrival at Arsenal that he expects to rediscover his best form under Arsene Wenger and, in what can be perceived as a fresh dig at former boss Mourinho, the 29-year-old says that his game is far more suited to the Gunners' attacking style of play.
"In the last year I played in Dortmund with Klopp, Dortmund was playing very good football and I think it seems to be a bit similar comparing Arsenal to Dortmund," he told ESPN.
"I'm very happy to be here. I get pleasure playing offensive football and being part of Arsenal. Every offensive player wants to play offensive football. For me as well, I always love to play offensive football, it's not easy to defend all the time.
"It's necessary to do the best for the team, but in this case, when Arsenal are playing offensive football, I'm trying to give everything I can give to the team."
Mkhitaryan has four assists in four matches since arriving at Arsenal, three of which came in one game against Everton.