The bad/smokey starts for Hamilton, Raikkonen and Vettel ruined the race for me, at least the race for the win. To be honest a few years ago I might have quite enjoyed this race but 2015 left F1 needing to do a hell of a lot to get me excited about it again. The final runs in qualifying were great (despite the system) but a bit of squabbling for the lower points positions in the race isn't enough to get me out of my seat, especially when a lot of it is straight-forward passes helped by DRS/different tyre strategies rather than prolonged battles.
I'm giving it possibly a slightly harsh 5. There is potential for this season to get interesting, though.