Yes, I nerd raged and recently got the platinum and the 100% completion rate.
Imo, Minigame Master is easily the hardest trophy because of golf and pool. Especially fucking pool.
-Roulette, poker and blackjack are the easiest and some of the fastest minigames to complete due to the items you find in the coin lockers.
-Fishing, bowling, karaoke, darts and the shooting arcade game are very easy once you figure how they are supposed to be played (at first I thought darts was impossible to play).
-Cee-lo, cho-han, oicho-cabu, koi-koi and the ufo catcher don't require much skill, but they're going to test your patience as they're very time-consuming and uninteresting.
-Extra hard baseball is ridiculous. Even with the FAQ's tips, it took me some time getting used to those ~150 km/h shots. Oh, and I'd to achieve over 1,600 points three more times to get enough 'chunks of ashes' to complete the modding list.
But the cheap AI made pool a much more daunting task for me.