Three stars may be a tad harsh. The approach here is to walk through the main line once, then give a few complete games. The games included are almost entirely from the 90s or 00s. You get about 50 pages on 3 e4, about 70 on the "3 Nf3 main line" (including Furman, Steinitz, 7 a4, Qe2 and -- nicely -- Bb3), and about 40 pages on the rest. The book would suit either White or Black, but this also means there will be big chunks to skip if, say, you choose not to meet e4 with e5.
The warnings, notes and tips are often aimed at a Starting Out level ("When attacking...consider eliminating your opponent's best defender") but the analysis seems to be at a higher level. The authors explain by mainly by giving variations, and as much as I like full games, it's easy to lose the plot with some of them. Of course, opening books aren't recommended for weak players, but I'm not sure if they shouldn't have done more hand-holding given the book series and the less than exhaustive coverage overall. (Rizzitano's book is, I understand, more appropriate for the 2000+ gang.)