It always cracks me up when child actors are able to totally nail their performances, even when they involve spouting technobabble, when adult actors just look confused or bored. I call this the Pomers/Beltran effect.

Shadowplay has some things going for it, some against it. The Odo/Dax storyline is pretty good. The Jake/O'Brien one is average (though I like how they decided not to take the Wesley Crusher "I must join Starfleet" approach with Jake). The Kira/Quark one is unforgettable.
The best thing it's got in it's favor is the third mention of the Dominion - letting us know that they're not just an economic and military power, but a group that has no problems with wiping out whole civilizations.
It amazes me though that this one episode does a better, quicker job of summing up the whole "holographic rights" issue than all the episodes of VOY that focused on it. "Maybe she's not real by our definition, but who's to say our's is the correct one?" Perfect, no need to dwell on it anymore.
Playing God - another one I'm not too fond of. It's not bad, but not good either. I probably don't enjoy this one because it's a Dax-centric episode, and Jadzia is my least favorite of the main cast.