There's a very real shot of anger in this, but what makes it so great is how that anger comes across in several different ways. You can take it as a late-night mumble or a howl that promises to shatter every window in the house. It's great.

For me this feels like frustration and sadness, but then that's a reflection of how I feel pretty much all the time. This is what makes great poetry a work of art. Being understood completely in completely different ways and being just as good to each reader.