Unlimited SaGa's combat system doesn't do much to alleviate the irksomeness of the rest of the game. In a strange twist on the RPG formula, you have both hit points and life points keeping you alive, with the HP simply serving as a buffer between enemy attacks and your LP. Once your HP is gone, attacks will start to cut into your LP, and only when your LP reaches zero will you die. Since your HP can be freely replenished between battles, surviving is simply a matter of making it out of a battle alive so you can "rest" and get back up to full health. You can queue up your characters' attacks during a battle, and when each attack comes up, you're presented with one of the game's new features: the "reel." This is a slot-machine-like wheel with a variety of icons on it, and you'll have to stop the wheel with a timed button press to determine the strength of your attack. Having to depend partially on timing and luck to win battles can get pretty annoying. The game does feature a degree of character customization, but it's all incredibly obscure and just makes one long for the simplicity of a Final Fantasy game.
The reel system is interesting in theory, but in practice it's just an annoyance.
Visually, your mileage with Unlimited SaGa will vary depending on your opinion of its method of presentation. On one hand, the hand-painted character portraits and backgrounds in the game are quite well done. On the other, they aren't animated--everything is entirely static. The only place you get anything resembling modern graphics is in the battle sequences, which feature sprite-based characters and rudimentary 3D backgrounds. So if you like the game's art style, you'll probably enjoy looking at it for a little while, but if you're looking for flashier or more-modern graphical fare, Unlimited SaGa won't be the slightest bit exciting. The game's catalog of sound effects is understandably limited, since little of it plays out in anything like an action scene, and the voice acting ranges from decent to really bad. Unlimited SaGa's soundtrack, however, is stupendous. Composed by Final Fantasy X alumnus Masashi Hamauzu, the music far outshines the game itself. Fans of previous Square musical efforts would do well to seek out the Unlimited SaGa soundtrack even if they pass on the game, which is advisable.
In the end, Unlimited SaGa is simply the flawed sum of its disparate parts. Every aspect of the game, from the combat mechanics to the movement to the technical execution of the graphics, is lacking in some regard, and when you add these elements together, you get a game that's simply unpleasant to play.