But he said he was clear about his decision to join the Gunners for a reported £8m on transfer deadline day.
"The best players in the world play in the Premier League and therefore it is the best league," he added. "The English people in [Euro] 1996 said 'Football's Coming Home' and that's branded in my mind - that football comes from England.
"I thought the atmosphere was great but if you're standing on the pitch and you see all the supporters around you it is a great feeling to be a player here."
Arsenal were in something of a mini-crisis when Mertesacker arrived at the club, coming after the Manchester United thrashing and with captain Cesc Fabregas, midfielder Samir Nasri and defender Gael Clichy all having decided to leave in the summer.
This was compounded by some far-from-encouraging results, with a 4-3 defeat at Blackburn coming in the German's third game for his new team.
"It was a critical moment for the club but I didn't feel that because if everything is new and you are a new player, everything is exciting," Mertesacker said.
"But if you are new you want to help the team, settle in quick, adapt quick."
Mertesacker added: "Every player had a big responsibility here. The club has great past and hopefully a very good future and therefore everyone takes the responsibility to be a good quality player."
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.