Hi and welcome. We're mostly UK based so can't really comment on US prices. Jaguar had reliability issues decades ago (in the bad days of Government ownership) and the reputation stuck to some extent, so it is true that traditionally Jaguar has always had higher depreciation than the Germans. In the same way, the German models have a reputation for reliability based on how they were built decades ago. Also not really relevant to today's models but image and often undeserved reputation drives prices. These days, there's little to choose between them. I've had 2 E Classes and a C class and they were excellent, very reliable cars and I'd say I've had a couple more minor trim issues with the Jag than I did with the Mercs, but in terms of mechanical issues, the Jag has had no issues in the 4 1/2 years I've owned it. Not something I could say about the Mercs and those were better made than the current models!
So no, if the prices are not unusually low for your area then I'd say you've discovered a secret - go and have a test drive.

 

See if you can find a 3.0 D "S".
Extra horsepower and incredible performance and acceleration.
All round mine is one of the best cars I've ever owned.
And at 73 I've owned a lot !!!

 

Don't think they sold that model in Gas Guzzler Land.
I suspect they'll be V8s

 

No major issues with the v8. The water pump can leak so check the coolant level is on the mark.