If I talk about KK in a positive light Laura will jump into the thread and attack me
But needless to say he deserves to be on the grid in a midfield team at worst, I think he could do well as a no2 at a top team too. Alonso/Kobayashi would be a pretty formidable line up. But as has been said, in a world that also contains Perez and Hulkenberg as well as all the top drivers that are in top cars at the moment there simply isn't room. Moving to a backmarker team hasn't done Kovi, Petrov or Glock much good so he might be right to take a year out and try again next year. If Gutierrez turns out to be terrible I'm sure Sauber would have him back. He could be a good replacement for Di Resta should he turn out to be too average next season. If Bottas is as good a racer as people say he is, Williams could be awesome with a Bottas/Kobayashi lineup, they certainly wouldn't have to worry if they were getting the most out of the car like they have been with Maldonado/Senna this year.
Kovalainen I've never really rated, his time at Mclaren was poor and his time at CaterLotus has been made to look like a complete waste of time by being beaten by Petrov. I think Caterham could do worse than to keep him but he isn't making the right noises so they won't even consider him. I won't miss him.
Petrov would be a reasonable midfield pay driver, certainly a step above the likes of Liuzzi, Karthikeyan, Senna etc. I was on the verge of shedding a tear when he got his podium at Australia, his drive was tremendous and it was well deserved. I wouldn't put him in a top car, but if Force India were short on money but still wanted constructors points he's a no brianer.
Senna I don't rate. I don't rate Maldonado either but he managed flashes of brilliance in what was clearly a very competent Williams, Senna didn't. The best he could do was some good overtakes in Malaysia and picking up points when others tripped over each other. People justify his place in F1 by saying he finished in the points lots, but 6 of those were 9ths and 10ths which are pretty useless points finishes, they wouldn't have counted this time 3 years ago and aside from a backmarker getting a point I don't really respect the achievement.
Glock I do rate, he's a good racer and I think would be good in the places I put Kobayashi earlier in the post. Alonso/Glock would get a fair few 1-2 finishes. Sadly he's been wasted at Marussia Virgin and has been let go just when they were showing promise. That he allowed them to break his contract says a lot about his character, and he never had a bad word to say about the team. He'd be wasted if he wasn't picked up in 2014, if not by Caterham this year.
Algy I think could be a top driver. His quali is pretty poor but if he was in a car that wasn't a Red Bull he could do some tremendous drives through the field Button USA 2012 style. Buemi never stood out to me but he seems well rounded, I think if Webber gets injured (god forbid) he'd do an admirable job at Red Bull. The right guy to have as the reserve driver but I wouldn't give him a seat in a top team on merit until he'd proven himself in a Sauber or an FI.
Sutil would be a great number 2 and would win races. It was clear to see his development from guaranteed last on the grid to regular Q3 participant in 2010 along with Kubica and the top 4 teams. His 2011 was less impressive but he still put Di Resta in the shade. Don't know if he'll ever be seen in F1 again because of the baggage he carries. People seem to forget he was strongly linked to Williams in 2012 and everyone seemed to think that was a good idea!
Heidfeld I rate better than most but he's had his day now. Renault were silly for dropping him mid-season as he was more or less level on points with Petrov but as the car dropped off it didn't make a blind bit of difference anyway. Many better and younger options available, wouldn't object to seeing him in a similar position to Pedro in 2012 though.
Pedro I love, he's a lovely guy and a strong racer. Performed very well vs Kobayashi in 2010, especially for an older guy. Shame things never worked out for him, his 2006 spell at Mclaren granted him the podium he deserved though and I think his work in F1 is done. He should cherish his reserve role at Ferrari, perform it until he's physically unable and then retire knowing he more or less achieved his potential in F1, and commands much more respect than many faster drivers to. Not many people are in F1 for about the right length of time and get what they deserve, Pedro did. I have a bit of a man crush for him too...
Narain can do one, he's also lovely but slow as hell and should go and race milk floats somewhere. Soundly trounced by Liuzzi does not a good driver make. Well and truly shown up by Pedro and everyone know what Pedro is capable of.
Rubens I think still deserves to be in F1, the fact that he was in for 19 seasons wasn't an accident. Williams was the right place for him to end his career but he still had a few seasons left in him. When Maldonado started beating him it was time to retire, but he showed Maldonado up big time and I still don't really understand why they dropped him. Would have maximised the car more often than Maldonado or Senna.
D'Ambrosio I think was made to look bad at Monza being thrown into a car with a KERS problem, qualified it fairly poorly and couldn't do anything about it in the race. He impressed me at Virgin and probably deserves another seat, no room for him though and I wouldn't kick anyone from the current grid out to give him a seat. Despite people moaning about pay drivers this years grid looks very strong.
Kubica is competitive rallying and I'd rather see that than him being poor in F1. He should be given some tests to see how his lap times compare with full time drivers and if they're OK he probably deserves a midfield seat for half a season to test him out, but at this stage I wouldn't be especially surprised or even disappointed if he didn't make it back to F1. At the end of the day rallying is extremely dangerous and while he didn't deserve what happened to him, it wasn't hard to predict and he should have taken more care. 20/20 hindsight and all that.