The graphics are actually pretty bad except for the cutscenes, jussayin. Days' gameplay gets repetitive after a while, and its magic system is horrible. KHRe:Coded is a better game in my opinion, unless you're going for story, in which case Days beats it out. Days' story is pretty compelling and has the best writing of the entire series thus far.
Oh, and here is a tip: complete every mission until you get the Gold Organization symbol the FIRST TIME YOU GO THROUGH THE MISSION unless you find it impossible to do so. If you gold clear every mission, you unlock the most overpowered character for the game's Mission Mode. /doneitonPCandonDS