From what I played of it so far.....I'd give it a 6. It has nice graphics (as far as DS graphics go), but it's easy to get turned around and confused in the environments as you fight the respawning braindead buttheads. I got stuck in a wall once already and had to reset. You don't really get any pointers as to where to go and no terrain map.....only a continent map that is mostly useless. One really annoying thing is that the focal point you'd like to be looking at is directly between the screens.
A little hint (since there is absolutely no tutorial in the game) tap the touchscreen to get to your inventory. If you go to the map screen, double tap the red spot to exit it. Those had me stuck for a bit, so I thought I'd let you guys know about that before you get stuck there yourself.
Wow! The map sure is HUGE if you scroll it around. I wonder how much of it you actually get to explore.
I'm assuming the green health bar is for magic, but I either haven't gained the ability yet, or I can't figure out how to use it.