We purchased a 2008 Sienna used last summer and

it!
We are a VW family...had two Jettas until dh's finally died at 14yo and 170K and we needed a new vehicle.
Dh and I looked at VW's van, but as someone else already mentioned it is just a reworked Dodge. I felt that the interior fell FAR short as compared to my 2007 Jetta and in total the van is just not up to VW's other vehicles.
After looking at both the Odyssey and the Sienna we went w/ the Toyota for a few reasons:
Driving - Love it! Dh is into performance driving and he preferred the Sienna over the Oddy hands down!
Comfort - The seats in the Oddy just weren't comfy at all.
Run Flat Tires - I did some research and those things are pricey and don't ride well. Didn't want to buy a car and have to replace the tires from the get go!
Room - Our 8 passenger Sienna has three FULL seats in the middle row. I can fit two LARGE car seats in each of the outboard locations and seat an adult in between them! Maybe not for 2 or 3 hour rides...but great for when we want to haul more people than just us!
LATCH (Lower Anchors and Tethers for CHildren) - The Sienna has lower and upper tether anchors in each of the middle row positions and two of the three third row positions.... more than any other van. I like having the flexibility when moving the kids around or driving with other families.
I had no hang ups getting a minivan but dh REALLY would have preferred another VW sedan (either a Jetta or Passat). The reality though was if we were doing anything other than regular day to day driving (work, grocery shopping, etc) we needed more cargo room. Heck our last trip to WDW before we got the van we had to tie two suitcases to the roof to get to the airport!
We now have the room to toss the kids bikes in the back (ours are on the roof) along with suitcases and other paraphenalia we need for 4 days at the beach...no problem.
After all his hemming and hawing over "settling" for a minivan, he loves being able to haul what we need to...and he has changed his mind about it being "uncool."
If we had to buy a minivan tomorrow...I'd go w/ the Sienna again in a heartbeat.