If Wenger already Aguero, Jesus, De Bruyne, Sterling, Silva x2, Sané, Fernandinho, Gundögan and a bottomless pit of money, spending £50m to get a player that ticks a lot of boxes is ready to go from minute one, and is very good at what you need him to be very good at in order for your team to function better - then I'd have absolutely no problem with it.
And that's without mentioning that they're weakening a team that is a supposed direct rival and finished ahead in the League last season. City have just taken their third or fourth best player off them and Spurs will probably go and spend it on some overpriced schmuck or a kid from somewhere because top players wouldn't touch them with a bargepole - and as an Arsenal fan I'll rejoice at any good player the scum lose for that very reason.