Although Fate/Unlimited Codes is a bit bland looking (besides the character models) and doesn't have many gameplay types besides Arcade, Versus and Missions, I definitely think it's worth downloading. Despite its problems, it's a really fun fighting game and works well on Sony's handheld.
A good fighting game but nothing else, that's what players are going to find in the latest production from Capcom. It's a very good way to explode the anime series Fae/Stay Night, with a very interesting gameplay mechanics that every fighting game lover will appreciate. Don't expect anything more, you won't find it in here.
Unlimited Codes is a competent 2.5D fighter that's bound to raise interest in the fighting game community, for better or worse. Newcomers will enjoy the game's simplified inputs, but may grow tired and frustrated when learning strategies for high-level play and advanced combos.
Packed full of great content (more than 250 missions, unlockable illustrations, movies, and character models) and supporting local wireless play, this is a game that belongs on your PSP. [Oct 2009, p.83]
Fate/Unlimited Codes isn't going to take the fighting community by storm, and it certainly doesn't hold a candle to current gen fighters on their respective systems, and for a $30 downloadable title on the PSP, it's a little pricey for the content given.