Apathy is the right word.
In the early part of the season, the weak tyres made racing unpredictable.
Vettel was not having it his own way and was having to work hard for points.
Once the tyres were made more durable, Vettel became unbeatable.
And it is this unbeatability which has ruined this season (for non-Vettel/RBR fans).
The audience know the winner of the race before the race weekend has even begun - which is pretty sad for any sporting event.
I think most are now waiting for next season to begin.