We built a stereo system in a 911 that consisted of two 10" drivers run at a wider range and two tweeters - and running not much more than 100W. That system won awards.
How? Well, I'd rather have 100 clean watts than 1000 muddy watts. And number of speakers isn't necessarily gong to create a pleasurable sound-stage.
Personally, I don't judge systems on # of speakers or watts, etc, but on how they sound. I'd want to hear it first.