I'm not saying that Kimi is constantly underperforming the car but there are some states between underperforming and having the best pace and I'm convinced Kimi is somewhere there. Overall Kimi's performance throughout the season wasn't that bad, but Grosjean has proved many times that the car was capable of more than Kimi delivered in some races.
but saying kimi's is constantly under-performing the car and RoGro is Constantly outpacing him is not logical either.
As there are some people who would like to put Kimi to the same category with Vettel, Alonso and Hamilton, I have to disagree with them. Kimi's race pace is sometimes very good (I.E. Hungary), but sometimes Grosjean is proving that the car is capable of more. (Canada, Valencia and Singapore are the obvious one and you can argue about Great Britain and China also, and it's quite high percentage given how often Grosjean makes him unavailable to compare in the race). And we cannot just left his qualifying issues. There are some drivers on the grid who can perform on both Saturday and Sunday. Weak qualifying makes it harder to get everything from the car in the race and a great recovery from low grid position isn't worth of praise if you could finish even better with a proper performance in qualifying which were bad down to you. For the moment, Kimi looks like a good midfield driver, but I want to see improved qualifying and outpacing Grosjean more convincingly in more races before I put him into the top driver category with Vettel, Alonso and Hamilton.
I rate him clearly out of top3 2012 drivers at any day of the week. Wheter he deserves 4th, 7th or 10th it's hard to say. It's really hard to compare drivers this season as I can see some kind of inconsistency from the most of the drivers on the grid.