Theme is king for me, and Stern hasn't really hit the nail on the head too often. I love playing LotR but cannot stand the theme, love the Simpsons theme but it's way too stop start for me. And those are their best games of those I have played (judgement reserved for a game on AC/DC which I have not yet played). At least with AC/DC we didn't get another movie theme. Ultimately I prefer the gameplay feel of other manufacturers and can't see a Stern entering the collection any time soon unless a killer theme emerges.
I feel exactly the same way about LOTR and Simpsons.