Yeah well.. not exactly their best episode.
At one point it got tiring of some characters who got so camera focused.. especially Esposito was a bit annoying and came off as very childish.
The idea is nice but somehow it didn't fire that well in Castle.. bits and pieces were funny and a nice way to get some angst into the episode when the camera caught Castle and Beckett in a personal moment which threatened to expose them to Gates.
Other than that the weakest episode of the season this far.. watchable but not in the same league as the other episodes so far.. however that's a pretty good cut i think.. 1 mediocre episode out of 7.
Really liked the jam session at the end though and Beckett's prank.