After driving one for a while all I can say is I was quite impressed. The power is surprisingly strong, especially in Sport+ mode, and the interior is very nice. I’ve driven lots of Camrys on rental lots, and I can tell you that is not a tarted up version of that car. I did feel that way about an ES350 about six years ago, but not this car.
2016 E350 is substantially faster than 2017 E300: 0-60 5.8 s vs. 6.5 s
https://www.0-60specs.com/mercedes-benz-e350-0-60-times/
https://www.0-60specs.com/mercedes-benz-e300-0-60-times/
The car is a fantastic car. I’m driving mine for 7 months. I average 27 miles to the gallon and the car is fantastic. Drive and keep.
Brandy
P.S. Stop nickel and diming yourself to death. You have a great car. If you need to save money, buy a smart car next time or a Civic or a Corolla.
Brandy
I turned off my daytime running lights on my c300 cause I thought it was too flashy/gawdy. the angry eyebrow looks too sassy for me and now I only turn them on when someone fragrantly cuts me off 
I agree with the sentiment that it is a bit of a flashy car but considering the deal you got, I think you should just enjoy it for 6 months then see where your trade in value to buyout value is (minus MSD) and see if the used car manager will make you an offer or carmax or some dealer that you want to trade for another car. If you really want to get rid of it, keep the miles low to maximize your trade in value.
6 month update - I’ve posted my lease on the marketplace: