Not sure why I never got to owning this title, but based on what I played at a friend's house and renting it from the local library, this was a lot of fun like the third game, but less memorable.
This is what I would consider the best of the meh games offered by Humongous Entertainment (see my list for the full ranking). It's on the border of okay to good, leaning more okay.
Freddi Fish 4 follows more or less the same logic as 3, having three McGuffins obtainable through quests of variable difficulty, and a culprit to pick at the end. It's fun, even if its setting is a bit eh.