Bloody Roar Primal Fury was one of the best out of the series just for its controls, feel, game mechanics, and new moves added to each character to further diversify the cast. It didn't have the best story and most Bloody Roars would have benefitted from having a deeper story mode, but without a doubt, this one's gameplay, its additional unlockables, characters, and modes made it the best.
Another really incredible thing about Bloody Roar Primal Fury was how it's match variety went through the roof. Due to mechanics like being able to cancel your jumps, not just jump cancelling moves but the opposite, or how you can guard cancel specials, choose to air recover in any direction or attack in the air behind or in front of yourself in during an air recovery, or the perfect timing dodge system, hyper beast forms having unique traits and allowing cancelling off of even more of the character's move set, and so much more, this game literally had no ceiling in its potential. It's a shame it was a Gamecube/Xbox only release and not released on the PS2 after Bloody Roar 3.
Now the only way to play it is through emulation and this game is STILL played competitively to this day. Bloody Roar NEEDS to come back as one of the most fun and insanely deep 3D fighting games. It incorporated a combination of 2D fighting game elements that you would never see in a 3D fighting game, making it the Marvel Vs Capcom of 3D fighters.