The 30-year-old midfielder had seven years at the north London club during their glory years so he can measure how far they have fallen.
"Things have changed a bit from when I was at Highbury and they were winning stuff," said Britton.
"It was a great performance, Arsenal had a lot of possession but on chances we probably edged it.
"It's nice to come back. It's a great football club, everyone knows the class Arsenal have got. I was here from nine to 16 so it's a great day for me as well."