In what seems to be the opposite of most on here, I infinitely prefer the SKY coverage to C4 in the UK. Coulthard seems a massive Red Bull fanboy (still on the payroll?) but I find him a terrible commentator so don't listen to him unless I absolutely have to. He's got a habit of stating the obvious at least 5 minutes after it became obvious to the viewers, and I find myself almost always pre-empting him if I'm watching with someone else.
I find Crofty entertaining, and that's half the game as a commentator, even if some of it is a bit frivelous. Clearly they need to try and appeal to the casual viewer. Also, let's not forget that the God and GOAT of commentary himself Murray Walker was famous for getting hugely excited, making bloopers, and getting things wrong and we all absolutely love him for that.
Only natural that UK broadcasters carry a bit of a British driver bias, but then again that's what (most) UK based fans want to see. Especially when one is a multiple world champion. They do a good job of featuring all the field throughout the course of a season. Sainz seems a favourite of SKY, and of course Ricciardo too, because he's really entertaining.