Checo. He's been quicker than Jenson quite a few times this year and it's not the drivers fault they built a crap car. He is learning and has done fairly well to be young, first year at a top team in a midfield car. He definitely deserves another year to prove himself IMHO.
I don't like what Perez has done this year, or maybe his behavior in some races but I think he deseves at least one more year at McLaren, with a better car.
It doesn´t matter that he is in midfield car, as a matter of fact, if you want to see driver´s quality, midfield car (or in other words, a crap car) is excellent test and indicator to the whole team and the fans. They already made a mistake once, with Heikki. They gave him 2nd chance and they´ve got nothing! They´ve lost one (or in that case - another) season with mediocre driver.
If you sign and drive for McLaren then you should be prepared 110% If you are young candidate, you need to show the McLaren team what can you do and 1 (one) year with 19-20 races is enough to do that! One year is enough time and in big teams like Ferrari, McLaren, and even Red Bull, that one year is all you should get! Case closed!
I really hoped that Sergio will succeed at McLaren but It turned out bad and he showed that he is not what the McLaren team looking for.