Well I have to say the panel gaps on this Merc are still considerably more consistent than my 2018 MX. It's also pretty common knowledge that Merc build quality, especially on their low end models, is nothing special and certainly not up to Audi/Porsche levels.
I would still rate Tesla build quality well below all the German brands, but its not that bad and I actually prefer Tesla choice of materials i.e. soft touch plastics, vegan leather etc. over the usual German bling and buttonfest.
I agree that the Merc interior is a complete dog's dinner and much prefer the Tesla approach to interior minimalism and tech.
I would also take a Model 3 any day over this Merc, even if the panel gaps are a little more dubious, lol.