I think the reasons people aren't big on it are pretty clear:

1. The added cost
2. The active shutter glasses-they're cumbersome, need charging, and are incredibly pricey ($100+ per pair) when they inevitably break
3. The limited, gimmicky, (and expensive) software...who really wants to pay $30 for a 40-minute IMAX movie about fish, or yet another copy of Shrek?

I did some homework and waited until the price dropped on the passive-lens sets. Yeah 3d is very gimmicky, but it makes for a hoot watching cartoons. Also looking very forward to trying out the Wii in 3D, but have to spring for some new cables.