Sorry I didn't see this post earlier. 😅
It's been pretty good so far -- battles feel good, story works pretty well. I will say that in terms of presentation, like dialogue and graphics, it definitely can feel dated, but the core of it still works.
I'm playing it via my Playstation Plus Extra, which has pretty much all of the 3D, non-MMO FF games, but it's probably pretty cheap on any digital store and goes on sale pretty frequently, so...yeah, I'd probably give it a shot.
I actually tried out the most recent alpha and I had fun with it. I have no experience with games like Super Smash Bros so I can't really compare it to others, but it felt easy to start but a challenge to master, which I think is a good thing for a game like this, and the fun factor of being able to play as Batman and fight Lebron James is just...just great.