100% success rate, only if you performed the trick with the controller sticks perfectly. Even with 5 star players, my success rate with tricks is pretty low. Given, I'm not that player who spends a lot of time practicing tricks, but still, isn't the way PES is doing tricks by pre-assigning them going to make it very easy to pull-off a string of complicated tricks?
I'm still a bit confused as to how PES is implementing their new trick system, but it sounds like it'll be easier rather than harder to pull of crazy stuff than FIFA.
Since PES has always been stat-driven, I'm assuming success rate would vary based on the technique stat. But if it wasn't, and was too easy to pull off, then it surely is plain stupid.