The England international joined the Gunners on transfer deadline day from Manchester United for a fee of £16m.
There have been question marks over the 23-year-old's goal record for the Red Devils, but Merson believes that his style of play will suit Arsenal's creative players.
"He ticks a lot of boxes for Arsenal. He will go beyond and is not worried about coming short like everyone else. People like Ozil, Ramsey and Cazorla will be licking their lips," he told Sky Sports News.
"If you're a midfielder, you're only as good as the centre-forward and vice-versa. You could be the best centre-forward in the world, but if you do not get the service, you won't score a goal."