It is fantastic as a revolutionary anti-racist, anti-imperialist history of the US Empire. I recommend it to virtually everyone on those grounds. However, his ideological basis is heavily informed by the widespread pessimism that followed the collapse of the US New Left anti-colonial struggles of internally oppressed nations (as Sakai characterizes). He embraces a brand of Third Worldism whose main practical application is to give up on revolutionary activity in the imperial core, since all workers are labor aristocrats who benefit more from imperialism than they are exploited by Capitalism.
While the degree of exploitation of workers in the imperial core is unquestionably lower, while White workers unquestionably benefit immensely from racism, we cannot accept defeat as a given.
The primary contradiction in the world is between Imperialist Nations and Colonized Nations. "Leftists" in the imperial core cannot wait for the comrades in the Global South to liberate themselves, we must be active strugglers for their liberation and our own. We must believe revolution is possible to hold any attitude other than 'lie down and rot'.
Also watching white people squirm reading is really fun. A comrade's conservative, racist sibling has possibly the only actual 'SJW Marxist Professor' in the US who is making the class read it. The comrade has been giving us updates on the growth of their sibling's growing guilt and political conciousness.
Read Settlers!