Feedback on 3-valve Engines

I’m thinking of buying my wife a new car. We’ve owned Mercedes for the last 19 years and German cars since the 50’s. My first choice would be a C320 but I really have my doubts about the new 3-valve engines. It appears that Mercedes primary objectives for these engines were cost and emissions reductions at the expense of reliability and performance.

I realize the advantages of the V6 but not a 90 degree V6 that’s inherently unbalanced. Having to use a balance shaft and soft motor mounts to overcome the inherent vibration is a compromise that bothers me.

I’ve also read about other problems like strange ticking sounds and problems with the variable length intake manifold.

I’d appreciate any feedback from those who own or maintain cars with these new 3-valve engines.

TIA,
Bud