Just like with 5th Element or Carnival of Souls, with one riffer, it's only okay...it needs 2 or 3 to really kick it off. I mean I have the original CoS Mike riff and I saw the one that RiffTrax graciously put up on YouTube (on their official channel). The extra riffers make the difference.

No offense, Mike...it's not you, I'd get the same "meh" with Kevin alone or Bill alone...a good riff needs more than one riffer!