>>96297699
First, I recommend downloading the fan compilation instead of using the original books for the core rules: https://sfrpg.com/sf20-release-street-fighter-the-storytelling-game-20th-anniversary-edition/

>broken pieces
I'd say there are four major areas:
>Backgrounds are quite vague
Animal Companion has no rules on how to make one, Allies only has guidelines such as "One Ally, of moderate power," etc.
>the rules on Willpower are contradictory
In one place it says you can't use WP in combat for automatic successes on damage, but then it has a combat example showing a PC doing exactly that; then, in another place, it says you can only spend one WP per turn, but a number of Maneuvers cost 2 WP to activate.
>later supplements added unbalanced Styles and Maneuvers
Apparently most everything that's incredibly broken was introduced after the Secrets of Shadaloo splat, e.g. Styles that came with intrinsic bonuses, the Cybernetics Unique Background that gives huge stat buffs, and broken Maneuvers like Improved Pin, which can put a target in a hold from an adjacent hex and then give a +3 bonus to keeping him held.
>rules for doing anything that isn't Street Fighting are lacking
You won't find much support for doing generic adventury things beyond applying skills and fiating difficulties. There isn't even a mechanic for death because dying is outside the genre assumptions.

>nobody seems to play it
The Brazilian community is apparently alive and well (there's a BR guy who's been putting out a fanzine for the last 9 years called Warrior's Fist), but yeah, aside from some grogs who have been playing it off and on since the 90s, it doesn't seem like there's much of a community in the Anglosphere. I've been playtesting with friends while I work on putting a proper campaign together.

1/3