This game is quick, and that's a good thing, because when it's long...it's not that enjoyable anymore.
But really, there are very few games that provide a good bit of thrill in just 10-15 minutes. For me more than 2 games in a row becomes a bit dull, so I call this a "filler" in the truest sense of the word: good for filling time until that sixth player shows up for something a little more complex.
I've met people happy to play 6 times in a row though...