INDIANAPOLIS — Every generation of entry-level compact Mercedes endured criticisms. My grandmother loved her 1987 190E and drove it 170,000 miles, but that car received constant carping from journalists for its cramped interior, underpowered engine, and supposedly low-rent interior materials. Having driven many 190E miles, the first two were correct, but the last is nonsense. I’ve heard similar carping about today’s compact Mercedes, the CLA250.