I love it !!!
The "whoo hoo" bit makes me laugh sometimes but it's better than the "shananana nana" part in Autum ;-)
"Autumn" is a good song but the "shanana" bit is a bit grating yeah, here it works somewhat better.
Love Marshall's riff on the chorus 
I've listened to "March in September" 10 or 15 times now

and yeah it sounds like classic NMA, i enjoy particularly the obssessive guitar bit playing endlessly at the end, it gives a quite epic and haunting feel to the song, isn't it?
with the song Today is a good day i think people who like Metal or heavy rock were surprised but glad to hear such a sounds in NMA (guitar riff and especially the bass line that start the tiltle)
well first time i heard "Today is a good day" i thought "Cool, a new song from New Metallicarmy!" ha ha
