Giants is a game you'll want to say you've played. The single player is amusing enough and the situations and characters are always good for a laugh.
Unfortunately, the game does little to pull you in to any of the storylines. It's more of a series of quests to do seemingly random things with different characters. While, at times, enjoyable, quickly becomes boring and a slog.
If you really enjoy non-sequitur humor, and don't mind sometimes hair-pulling frustrating levels, you'll enjoy this game.