I'm reading the introduction, and this comic is pretty accurate. One paragraph is compelling and then the next is the most virulent racism you could possibly write. Some of his conclusions seem to be ignorant of the very thing he just wrote as he is completely blinded by the superiority of Germans or some shit.
Big 
energy
damn that mneans karl marx had to read through at least 300 pages of extreme racism before stopping, hmmm
Cedric Robinson thought that an unconscious German nationalism on Marx and Engles' part hindred their analysis of nationalism, so there's that.
That's mildly true in their early years, but it's overstated, and it was completely excised after the failures of 1848