I'm going to have to come in here and say that people who haven't played tons of Trick Room can't use theorymon as a good reason to reject (not to downplay you Chou). Having a Bug, Dark, Ghost resist on a team (especially in lower tiers because most attacks are weaker) is so helpful; this is something that isn't seen unless you have a good grasp on how to play Trick Room, which requires more than a few matches I might mention. Volt Switch too? I don't know if people realize how helpful that is for Trick Room.
The "bulk" of Deoxys and stuff is great, but the thing is they all share common weaknesses. Once you come across something that preys on that, you are going to have a hard time setting up, especially since Trick Room is ALWAYS LAST. You might say "you can just get something that eliminates those ghosts, darks, and bugs" but they can easily switch out while you try to put offensive pressure on them because you won't be getting many hazards up.
The point is, however, that theorymoning Trick Room isn't really a good way to approach it (remember how the community theory'd Moody would suck, but it ended up broken? Think kind of like that).
Also, I'm not saying Trick Room is good. Frankly, it's pretty bad at the moment everywhere because everything is too bulky and too powerful.
@ Paradoxus: Klingklang isn't abusing Trick Room. It's supposed to be setting it up.