The Sienna is not only one of the most spacious minivans, but it is also at once the most powerful and fuel-efficient. It is also the only minivan on the market to offer an all-wheel drive version, a welcome element, especially in our parts. Unfortunately, Toyota isn't obtaining the expected success with this model. This may be explained by the waning popularity of minivans, by the age of the model, and by its rather high price tag. And it is clear that the Sienna doesn't offer a very exciting driving experience.