OK. I will start I suppose.
My car:
1985 Mercedes 380SE 4dr sedan.
Color: Silver, with dark blue MB-Tex interior
264K miles, runs great, especially for a 21 year old car.
Manufactured in October of 1984.
Favorite things: I LOVE the way this car drives and rides. Excellent handling, yet soft and supple ride. Excellent guage layout as in all Mercedes cars. Another plus is the way the turn signals stay on a little longer after a turn (Stay flashing until turn is complete, which is a common thing with most European cars. Excellent power, excellent braking, transmission performance. The quality of the interior/controls. Still no leaks (hope I do not kinx myself). The way the doors close with a solid "thunk". The solid feel of the car in general.
Least favorite things: Controls can be confusing to a "new" MB owner. I am awaiting my owners manual, to figure out things about it. My other dislikes about it are common with these cars, such as the "stopped up" drain problems and potential rear window leaks. High maintainence costs are also a negative, but that goes with owning a MB. Lack of tilt steering wheel, which seems odd on a super high end luxury make. Even some American cars of the 50s had this feature and more common on the 60s American cars. Another dislike is the burden of not knowing if and/or when the "upper rails" and "chain guides" were changed. Timing chain/tensioner obviously OK, because no noises, even at cold startup, at least at this time.

These are all petty things though.
Things on the list "to do": Change transmission fluid/filter, new spark plugs, another oil/filter change in about 900 miles, find the interior leak, try to get the paint back a little shinier, change out the "green" anti-freeze, replace front/rear brake pads and change out power steering fluid.
I am sure I will think of more.