Though no one's going to mistake the car for a Lotus, you can still have some fun in it while improving your fuel economy. It sounds weird at first, sure, but it works for the same reason an underpowered-yet-lightweight Miata is a good track car: physics. Just as the secret to a good lap time isn't how fast you go in the straights, but how little you have to slow down in the corners, fuel economy is all about maintaining your momentum as much as possible so you need less energy after a turn. When you apply this principle to a road-oriented hybrid, it works.
The bottom line is that, unless you take hypermiling to the extreme on a regular basis, you'll save more fuel while driving a hybrid if you actually try to have fun with it rather than just trying to keep the tachometer needle as low as possible.