The "New" Mario and Luigi don't disappoint.
Story: This game doesn't really have a storyline except for Bowser Jr. taking Princess Peach.
Characters:
Mario: The hero plumber, heroing once again.
Luigi: (same as Mario except for the fact that you have to use a cheat to play as him)
Peach: Gets kidnapped, again.
Bowser: The big boss, but you kill him in the beginning Bowser Jr.: The main antagonist in this game
Sound/music: Same as usual
Boss fights: Easy, but fun, occasionally hard like one Bowser Jr. battle
Overall I would say this game is very fun and I would recommend it to Mario fans, and DS fans of all ages!