All single player modes are a 3/5, tbh. They're fine, give you enough challenge, but are also frustrating given the limited check points, high difficulty of some missions and they lock away fun additions for multiplayer (which I get, but this was annoying to me even back in 2003)

The multiplayer is what gets a 5/5 because it is a fun, chaotic time. It has a ton of customizable options such as what weapons spawn and where, a tons of unique weapons (electro tool and remote mines are great), many weapons have duel-wielding variants (such as sawed-off shotguns and tommyguns) and dozens of unique characters to play as, including but not limited to a gingerbread man, monkeys, a skeleton priest, robots, a duckman, golems and zombies