As we're unlikely to see terraces again at football, this is the virtual equivalent where you can chat to your hearts content about all football matters and, obviously, Arsenal in particular. This forum encourages all Gooners to visit and contribute so please keep it respectful, clean and topical.
If we accept your assertion that Arteta and Kos have been good signings then I think AW had done OK, although both were subjected to a lot of abuse on this forum for their early performances (including from me).
Arteta started off in a more advanced position but didn't play well, imo he has added a lot now that AW has dropped him a bit deeper.
Kos was vilified for a long time on these pages and now people are praising him.
Most top clubs (Citeh excepted) only make two or three signings a year usually with mixed success (Torres, Downing, Carroll, Henderson, Lukaku, Jones, Nasri etc).
imo AW's weakness has been, over a number of years, to fail to recognise the teams shortcomings quickly enough to be able to bring players in early enough to settle in and perform.
arteta is a great player. but agreed, wenger's signings have been well below par, specially attacking players. don't remember the last good attacker (striker or attacking mid) he bought us. i don't think nasri counts, neither does arshavin.
at least he learned to buy centrebacks (verminator and koscielny are class)
Koscielny is an excellent defender - he almost single handedly got us something out of the Fulham game and has done brilliantly in a defence that has chopped and changed around him - including moving positions himself.
Take VP out of it, far and away our best player this season.
Wenger is correctly getting some stick - but got to give credit for this one.
Arteta. I would have loved this signing last year rather than this summer. I think that he divides opinion, but I think that he is class - tough tackler and can play a decent ball as well.