Part of WiiLoveIt's review:

Personality is another big reason why Cooking Mama has lasted this long. This is something that has stemmed mostly from Mama's humorous attempts at the English language, albeit I didn't find these to be as funny as the clips I've heard in the past. Exhibiting more personality are Mama's facial gestures that appear when the player makes stumbles along the way. I almost came to the point of laughing when smoke from a pot of burnt popcorn filled the 3D Screen, leaving poor Mama with a disgruntled look and black residue on her face. At another point, I splattered ketchup everywhere and had to wipe the screen with a small cloth. It's little things like that that make you feel a little more at home with Mama and her tutoring methods.

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Source: WiiLoveIt