Meh, Vermaelen, Koscielny, AOC and Sagna were fairly underwhelming when they got here while Arshavin, Reyes and Walcott were greeted with the greatest hype.
It's hard to say until you get to see them week in, week out.
But our biggest hope right now are players that are already at the club, like AOC, Wilshere, Ramsey, Szczesny and Miyaichi. Just like United are opting to put their faith in Welbeck, Jones, De Gea and Smalling. I think all those players have the talent to be extraordinarily good, and it's just a question of them being able to realise it while still keeping hold of the senior players at the top so that we don't becoming a feeder club.