If I could be able to rate this 4.5-4.7 ⭐ I would—giving it a perfect "5" is a tad high for me, but "4" is way too low—I guess this is from purely rounding up.
I didn't even know this book existed until I saw a listing of it online one day, and if I hadn't been on a fixation revisiting my interest in TMNT I wouldn't have given it a second look. But I guess the stars aligned on this because due to said recent fixation, I bought it for a really great deal of $5 and was an excellent read from start to finish! And I didn't miss out on anything, as this particular book I picked up was complete with all the inserts and freebies included (things that are commonly missing when it comes to secondhand/thrifted books).
It was fun reading into the long (visual!) history of the Teenage Mutant Ninja Turtles franchise from its humble beginnings as what was essentially a shitpost shared between two friends made into an indie comic to a multi-million franchise that spanned countless toys, comic books, many movies and a handful of memorable TV shows, among many others.
I can't really speak on sections I either haven't grown up with/knew personally (like the sections dedicated 1980's cartoon, the ones dedicated to the early live action movies, etc.) but one personal gripe I have is that the book's section dedicated to the 2003 cartoon, while informative and thorough, leaned into the "Back to the Sewers" art too much. I would've loved to see more concepts and artworks for the first five seasons of the 2003 show (especially since that was what encompassed the show's run prior to the network retooling it to be lighter in tone in "Fast Forward" onward), and this strange fixation toward the BttS art kind of ruined the vibe for me.
(Especially given that, while "Fast Forward" may still have its fans, "Back to the Sewer" in particular is usually regarded as the lowest point among peers who experienced the 2003 show.)
I've seen the news that this book would be revised to include subsequent additions to the Turtles franchise—namely, 2018's Rise of the TMNT, the recent Mutant Mayhem, to name a couple—as well as reworking some of the already existing chapters, so I'm hoping the chapter dedicated to the 2003 series gets reworked as well. (Maybe mentions of some of the truly lost (unreleased) episodes and arcs? But that's just wishful thinking.)