At this point it looks to me like 2008>2006>2009>2007
At this point not many players from 2009 have actual done anything at the NHL level. Only the top 4, MPS, Kulikov, Johansson, O'Reilly and Clifford have played a full NHL season.
A guy like Josefson is one of the furthest ahead players not on that list and he has only played a sheltered fringe role on a bad team in the NHL and didn't produce much in the AHL or NHL last year. Even in the AHL, only Palmieri from the first round and Tatar from the second had strong years. At this point there isn't enough to go on in terms of North American professional hockey from this year to really judge how good it is.
2009 was a strong draft in terms of potential elite level players and potential NHLers. Tavares, Duchenne, Hedman, Kane, Schenn, OEL, Kadri, MPS, Kulikov all have top line talent to a certain extent. Toss in Erixon, Rundblad, Ellis, Despress, Moore, Josefeson, Cowen, Kassian, CO Roussel, Orlov, Morin, Blacker, Lehner, Elliot, Tatar, Lander, Silfverberg who all progressed to the level that was expected or higher and you have a draft that could develop a lot NHL regulars. It may not be the level of the 2003 draft but it has a lot of potential.