The car is still better than last year's. The degradation was okay, 2 stopper was an optimistic attempt but overall, they shoudn't be too disappointed with the car's performance. They have made up a lot of ground on Lotus, Ferrari and RBR. 1st stint pace is a worry but i wonder how much a rain setup was responsible for the lack of pace today.
The biggest concern though is reliability. They have got to start getting both cars to the chequered flag. Also, their pit stops were horrible. Merc is losing a full second to a second and half to ferrari and rbr in the pits (didnt note lotus pitstop times).
Lot of scope for improvement, lets see what upgrades they bring for Malaysia