You're not off base by any means. I popped one back in June 2008 because I was curious. Infanticide? Kind of, but I like 'em young. That being said, I will be holding my other bottles for at least a year after trying this. What I found was very strong drying tannins and a high acid level. Searing white pepper with lots of dark fruit with a little of the meaty thing going for it.
There was a bit of that stemmyness from the whole cluster fermentation style that KB and Ed K. are fond of. I'm growing more fond of it every time I have one of each of their syrahs.
As far as the complexity blowing off and being left with what sounds like a quaffable grapey drink, that didn't happen to me. I just got harsher tannins as the time passed. The spice fruit balance remained more or less constant.
Tim
p.s. FWIW, Wine Spectator has pegged this bottle as a Drink now through 2011. (!?)