This must be hard if you're a Red Bull fan
... Or a Lotus fan.
... Or just not a Mercedes fan.
I'm actually a little bit disappointed, because what I wanted to see was Vettel given a true test by top drivers in equal or slightly superior machinery - if he's stuck in the midfield it doesn't prove a darned thing, because the greatest driver to live couldn't win the championship with a midfield car.
On the other hand, as a McLaren supporter I see them having a real shot at the championship - although it won't be easy. Their driver lineup isn't any better (unless Magnussen is a driving god) and they'll really need to work to make the car better. Although it does seem to possibly be more reliable as of yet, and if they can finish second to Mercedes on the races were both finish and first when the Merc breaks down they could definitely still win.
And of course you can't really count Ferrari out either - I am not one of those who assumes they've shown their real pace yet.