Obviously coming from a point of view in which he finds areas to criticize. The 113, in my opinion, was not built for speed, racing, hard cornering or anything of the like. It was built as a sporty, comfortable, reliable boulevard cruiser with the MB cache to garner significant sales. In that respect, it well succeeded. IMO, that era of MB cars were some of the best engineered and best built cars they ever produced. It is a sporty car I will still be able to comfortably drive when I'm old and crotchety.
While he did cover some of the differences in the 230,250, 280 model progression, he missed the nuances of the 250 transition and the significant (he lightly touched on them) cosmetic changes from the 230 to the 280 for US safety regulations.
I regularly shift gears in the 3500-4500 area. It feels like the "right" place for me. The car will move past 4500 if desired, but seems to convey a message that it'd rather not, unlike my vintage Porsches and Jaguar which freely wind to higher revs. My 190 SL feels the same as the 113 in terms of willingness of the engine to rev. Too many vintage MB drivers, IMO, seem afraid to take their revs higher than 2500.