Just play it!
The tone of the game is very fun. It doesn't take itself too seriously like most DS square enix games of the same genres. I laughed out loud when I read the dialog between laharl and the first mid-boss (and a few other times, but that one stuck out cause I went through it twice).
The beginning is a little overwhelming, but I just rushed through it and re-read all of the tutorial stuffs after I got a handle on everything
Apparently this is EVERYTHING from the PS2 version stuffed into one tiny DS cartridge, which I find truly amazing, especially since all of the secrets from the PS2 version (that I've looked up) are also included in this game.
Go get it, it's like no other game you've ever played. It's more fast-paced than FFTA2 and has a much more interesting story.