It's crazy how big this game seemed to me as a kid when I watched people play it (I was definitely less than 11 years old then, way too young for this game's subject matter)

It's sleazy and pretty varied fun, but I don't really see any big reason to play it. Saints Row 4 is bigger, funnier (I think I laughed twice from the written jokes in the 3rd) and probably plays better. Go play that.