Not going to debate it, as there are Arsenal fans who feel the same - but I completely disagree. Most goals in Spain the past 6 years save Ronaldo/Messi - the best players on the planet, and he's not even first choice. Playing with Ronaldo and still scoring is okay with me. He may come in and flop, but he's still young/hungry and he's never been the focal point of an attack. That might hinder him as much as help him though, time will tell. He's also been excellent for Argentina, playing with the GOAT. Moot until he signs anyways, but I'd have taken him over Rooney at the start of the summer (a stance a lot of Arsenal fans disagree with). if he comes in at the estimated price of $22m pounds, the price is right as well.
That said, if he's the only "big" player to come in - we still have problems. Arteta is solid, but we need a Fellaini/Bender etc. Hard to see Arsenal spending $40+ on 2 players alone.