Entirely subjective review.
As it's an rpg I'll treat it like one despite being based on a mmo.
Story 3/10 - you wan't to become stronger after your mother died so you can protect others, that's it. Story can be simple, but here, the way it's told is simply not good.
Graphics 5/10 - ds is capable of much more, terrain is bland, skill animations are weak. Sprites are ok. Dungeons are plain ugly.
Sound 4/10 - sound effects are average nothing special. Very tedious tunes repeating over and over again
Gameplay 7/10 - simple but effective. You tap a monster and start auto-attacking choosing skills from the hotbar and taping, slashing on the enemy monster in between. Two companions make killing easier. You buy new equipment, you can upgrade it, take some sidequests usually covering killing some monsters. Dungeons are quite complex yet their so unappealing it's hard to go on.
Fun Factor 6/10 - basically you're just grinding. Moving from point A to point B while killing all that you can progressing through the story. Very annoying thing is constant backtracking that breaks up the pace. Killing all that moves is fun at beginning but later on it becomes a drag and is just plainly boring.
If you like grinding without any deep story, just kill something, kick back and relax go for it. If you want something more than lvls this is not the game for you.