Based on true events usually means that the true events are fictionalized and made more spectacular. Since I am Italian, I already knew what happened between Patrizia Reggiani and Maurizio Gucci, because at the time their lurid story occupied headlines in national newspapers. The real story seemed to have gone more or less as described, with Patrizia being a vulgar gold digger, who used to consult fortune tellers and ended up hiring her killer via her "clairvoyant" BFF, once Maurizio dumped her.
Lady Gaga nails the part, probably thanks to her natural arrogance, and she looks a lot like a prettier version of the real Patrizia; Driver is bland as usual, although his part probably called for a weak character; Pacino is a tad more subdued than usual, which is much appreciated but Jared Leto as Paolo Gucci is unbearable, more than an eccentric Italian he does a version of what an American considers typical Italian, missing completely the mark and spoiling it further with a dreadful accent.
Even if costumes and locations are generally OK, the soundtrack is extremely sloppy, as if nobody could be bothered to do some research and produce a soundtrack suitable to the time and place. Instead, they took the shortcut of going for Italian opera, the trite soundtrack of choice for movies with Italian characters, even if by now is super outdated; a couple of Italian songs from the Sixties sounded totally wrong because the film takes places in the Eighties and a few disco hits blasted on incongruously at the wrong time... totally not an Italian atmosphere, unless you think in Italy time stopped with La Dolce Vita, or even earlier with Verdi.
Apart from the dreadful soundtrack, some parts (mainly all those with Leto) dragged on too long and dragged the movie down.
PS in the first third of the film Maurizio Gucci is jumping wildly inside one of the shops and stopping in a freeze-frame that we discover right at the end, belongs to a photo shooting with Avedon. What was that? Did nobody check the editing?
Tingnan pa 
