Iwobi plays on the left, Ramsey is next to useless on the wing, Ox's goal record is worse than mine, Walcott seems to be going backwards every season (I think he's going to go any way), Wenger doesn't rate Campbell (though most Arsenal fans like him). Mahrez is a massive upgrade on all of them. That said, Wenger will probably play him as a striker.
What worries me more is there's such consternation around the striker options, the defence has been neglected again. If we only bought a quality central defender I'd almost be happy, we might not score many but if we stopped conceding so many we'd be a force.