After having the car for 10 months, I think it compares well with a midsize car. It's certainly not small. We can haul 5 people + a decent amount of cargo in the back. Perhaps not as much as an Accord, but it probably depends on shape since the Accord has a trunk and we have a hatch.
The width is less, so it's tighter than the Camry or Accord, but it's a similar size for people/cargo.
I understand your point on the comparisons, but I have two reasons. First is that a minivan would have been wasteful, but that was the alternative for us. Mostly because without the hybrid savings, I'm not a big fan of sedans. So that's my savings.
The second is that I don't have experience, nor have I access to those other cars to guess on mileage. Having had 4 minivans over 12 years, I have a pretty good idea of the gas mileage and how it will go with those vehicles.
Jason, I think you're stuck. O-lineman need to stuck with the trucks 🙂
As far as the downsides of hybrids, I have no idea what will come when we do the batteries. I don't know how long they'll last (appears to be well over 100,000 from reports) and no idea of the impact. There was an article a couple years ago that said overall the Hummer H2 was more eco-friendly because of the way the two vehicles are manufactured. I think the problem is defining what's eco-friendly. Is disposal more or less important than emissions? Hard to say.
I like the Prius, it's not perfect, not for everyone and it's a nice supplement for our lifestyle. I think a hybrid or even electric are good second cars, especially if you need to commute and it's often 1-2 people. However I like my 911 and definitely prefer driving it 🙂