Vettel didn't impress much either until Fuji 2007. You should know that even your own countryman Kovalainen was pretty much out of his depth during first half of 2007 before coming good. And Rosberg wasn't showing much in 2006. If you claim Grosjean shouldn't be in F1, may I ask that who else should be then? Grosjean is the #1 driver ready to join F1 in case of any vacancy. Other drivers in feeder series have been performing below his level. And finally Renault at the end of 2009 wasn't a "top team". In fact, it had one of the worst cars on the grid at that time (depending on the circuit too, of course).