The lines are choppy and sloppy, and these scenes are far below the quality of the TV SpongeBob cartoons, visually speaking.
In the cutscenes, however, the characters appear to have been rather hastily drawn by someone new to computer animation. The game retains the exact same style of scenery, probably even drawn by the same artist(s), but the characters and some other objects are 3D superimposed on these 2D backgrounds. I don't know the right terminology, but the show is just your standard, run-of-the-mill medium-grade 2D cartoon animation, two or three steps below the efforts of Disney or Don Bluth but about 20 steps above, for instance, a Pokemon episode. However, the game's animation is markedly different than the show's.
The game is pretty true to the TV show in terms of humor and presentation, even down to employing the same TV voice actors for the game's main characters. Destroy a Weather Controlling Thingamajig, explore caves of a powerful 'Marlin,' and hang out at the local diner - all in a day's work for the pineapple dwelling SpongeBob and his friends. Join SpongeBob and the gang in a puzzling adventure to reach Neptune's Pacific Paradise. Get ready to serve up some Krabby Patties at the Krusty Krab - the lovable sea sponge makes his PC debut in SpongeBob SquarePants: Employee of the Month.