I generally use gametrailers for reviews. They do a very good breakdown analysis on games.
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It does have a interesting storyline, sort of like Groundhogs day, where the same day constantly looping around with some interesting plot twist.
Grimgrimoire is really a simplified real time strategy game(rts). Like any rts, you can hire units to gather resources then use these resources to improve your army. The biggest distinction is you can build 4 different group, and pause control. This feature is add in to compensate the lack of buttons or hotkey in a playstation 2 controller. When selecting your units or creating commands the screen pause giving better control of your units. Greats for beginnings who don't like the overcomplicated hot key commands in pc rts like micro mangement. To serious rts players, find these controls very cumbersome. Another problem is lack of multiplayer and it is very short game,it takes about 15 hours to beat.
Regardless, the game is very enjoyable to play with it's distinctive artist style and game play.
For me, I rather play pc rts instead. They are so much better with maps creation, unit control, free online play, patches to balance game play, multi player, lower cost ,and you can download custom maps.