“Try to imagine for a moment that Batman were real. A powerfully built man in cape, tights, and mask walks among us in broad daylight, recognized everywhere by his adoring fans. Anywhere else, this is a situation out of a comic book. In Mexico, however, they ask for his autograph, then pay money at the local arena or movie theater to watch him do his thing, be it real or imaginary.”
—Robert Cotter, The Mexican Masked Wrestler And Monster Filmography
I don't play Hero System, but they put out some great supplements (same for GURPS). I tore through Lucha Libre Hero in the last week. It's a great supplement...as a brief overview and introduction to the genre for those unfamiliar, but it felt like a bit of a let down compared to some of the other Hero genre books. Especially Pulp Hero. I'd say that book is the definitive guide to pulp in RPGs. Lucha Libre Hero might be the definitive by default as it might be the only RPG book on the genre. There are RPGs and RPG books about wrestling, sure, and a few of them touch on lucha libre, but this is the only dedicated lucha libre book I know of for RPGs.
To be clear, the book is not so much about lucha libre as a sport and playing in the milieu,
it's about the amazing luchador films that mostly came out in the 60s and 70s. Imagine super low-budget superhero movies with masked luchadores as street-level do-gooders. There's no/not much flying around on wires or trips to Asgard (that I know of), rather think of Luke Cage...in Mexico...with a luchador mask...using wrestling moves...fighting against witches, robots, alien invasions, cults, evil luchadores, mutants, mobsters, and mad scientists. It is so much fun.
The book's written well, the authors clearly love the genre, they provide some great pointers to bring the genre to life at the table, and give further resources on the genre. The source material section in the back might be worth the cover price alone. A three-page chronological list of what looks like every single lucha movie at the time or writing. The authors' top picks for what to watch. A bibliography that will point you directly to The Mexican Masked Wrestler And Monster Filmography by Robert Cotter, which is a fantastic resource unto itself. The Cotter book gives brief descriptions of most lucha films including plot details that make most readers' heads spin. It's an absolute gold mine for insane plot ideas. And of course Lucha Libre Hero provides a massive glossary, including both for general wrestling terms and lucha specific terms.
But, it's a Hero book and has a trimmed down set of the full game rules, along with all the mechanics heavy widgets you need to build characters, etc. So a lot of the page count is eaten up by mechanics you won't need unless you're playing Hero. And the book's only 266 pages. If you like Hero, like luchador movies, or just like epically weird stuff, Lucha Libre Hero is worth picking up.