He 100% deserves this championship as he has been fantastic this year, but nobody can say that he doesn't deserve the boos.
He's a sportsman, competitive by nature and on top of that paid to do the best he can each weekend. What's he supposed to do, throw a race or two to make it more entertaining?
To put it in a blunt and overly aggressive but entertaining way; it's not his fault that everyone else sucks.
Does Usain Bolt slow down and let other people win sometimes? Hell, no.
It would be worthy of booing if Vettel slowed down to let the races be closer. Who wants to see a race where everyone isn't trying their hardest? That's just entertainment, not sports.
Sports is a competition. And sometimes one person (or person and car in this case) is just that much better than everyone else.
I figure it's mostly just tall poppy syndrome. You're allowed to be good, but you're not allowed to be too good.
I don't think anyone deserves to get booed for turning up to work and doing their job well. Particularly when them doing their job well is largely every other team doing their job not as well. There are drivers that can match Vettel. There are cars on the grid that are at times faster than the RB9.
Blame the other teams for the boring races. RB and Vettel are just doing what they're supposed to do, try as hard as they can to win. Boo Renault for blowing up Grosjean's engine. Boo Kimi for qualifying halfway down the field, injured back or no. Boo Ferrari for building a crap car that Alonso has to drive the wheels off to even get within 30 seconds of Vettel. Boo Mercedes for building a car that's only fast for a lap and a half at a time. Boo McLaren for building a midfield car. Boo Sauber and Williams for going from building cars that can take the odd win, to cars that can take the odd point.
Bar Red Bull and possibly Mercedes and Lotus, most of the teams seem to have cars this year that are not as promising as last year. And Merc and Lotus seem unable to turn it on consistently, particularly Merc and their tyre troubles.
Do you really expect RB not to dominate in that environment?