Hybrid's battery capacity

There are many hybrid cars in the market now and they all vary in types and performance levels. There are the plug-in type that has less energy recovery capacity compared to the parallel hybrid but offers the advantage of drive on pure electric power for a certain range using the power charged from a socket. The parallel hybrid on the other rely solely on recharging while the car is coasting or during deceleration. Both concepts work based on their intended design but some ideas are quite useless in my opinion.

Lets take the example of the new Nissan Serena S-hybrid. This is by far one of the most pathetic systems in the automotive market. It only offers barely 1 second of battery power boost for the car. The battery is so small that it is hardly even a hybrid. It is aimed at saving fuel but having to shift the car's mass the electric power boost is practically negligible. Even hybrids made in China offer far more battery power than the Serena. With only 1 second worth of electric power it is almost pointless to have it.

Under coasting or constant cruising the electric power will cut in to reduce fuel consumption but the battery capacity is far too small to really make a big difference. Unlike the Prius or other Toyota hybrids most of them are capable of boosting power for at least 10 to 20 seconds which is far more useful and can run on electric power mode for far longer distances. I am shocked that a reputable company like Nissan can even approve the design and manufacture of a car like the Serena. I don't like bashing cars but this model really takes the cake!

The Mercedes E300 diesel hybrid has a small battery pack for its hybrid system but it can still achieve 25km-40km on electric mode and offer good electric power boost when the car needs it. The electric power boost is useful and truly extends the range of the car making it ultra economical to drive.

I am wondering if Nissan tried to do this with the Serena because they wanted to jump on the hybrid bandwagon or they didn't have the budget to go with a bigger battery since the Serena is aimed at the entry level market. Either way it is crazy to offer something that is practically useless and call it a hybrid. Makes no sense and also makes Nissan look bad in my opinion.