Nothing has gone wrong.
This is the improved 'New Generation' model with redesigned interior.
The build quality is excellent and the materials used throughout the car are first rate.
Performance is good although at low revs the engine feels a bit underpowered in stop and go traffic.
On the highway, the supercharger helps the engine pull strongly but it gets a bit loud at higher revs.
Handling, steering and brakes all feel very good which gives the driver a sense of confidence.
Interior room is good for this class of car and four people can ride in it very comfortably.
The 4 cylinder Mercedes models are reliable than the V-6 because I see more 190E 2.3, C220, C230, and C230 Kompressor on the road today with high mileage. I currently have 141,000 miles on my 4 cylinder 1996 C220 and it is still running like it was new. I expect this car to last from 300,000-400,000+ miles. Just do the oil change every 3,000 miles on the 4 cylinder engine and it will last a long time. If I was to purchase my next Mercedes, it would be either the 4 cylinder C-Class 1.8-2.3 liter or the V-8 S-Class 4.2-4.3 liter model depending on what I can afford. The 5.0+ liter V-8 models on a Mercedes tend to have maintenance issues like oil leaks and suspension problems as it gets older.