Toyota has a huge number of new 2015 Sienna LEs still on the lots, so prices are very fair. We paid 28K a few months ago, plus tax, license, etc. Depreciation on Siennas and Odysseys isn't like other cars. For whatever reason, they seem to hold their value very well. Because we bought the entry level version, it costs less new than a 2 y.o. version of the higher end models. I would rather have two years of use of a brand new car than have an electric motor open and close the rear liftgate. I never thought I would buy a new car because of the depreciation, but economically, our decision worked best for us (and we are on a tight budget).

Is driving a Sienna a joyful experience? Not really. It is a utilitarian vehicle and a very useful one at that. But many of us can appreciate a car for its utility and those types of people would enjoy owning a Sienna or Odyssey. If you plan on owning the car for a long time, my research suggests that those two or the Mazda minivan are the most reliable options.

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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).