I have found that RU has been an interesting playground for Trick Room Teams. While I was never warm to TR in Gen IV, at least in OU, I have found that the Trick Room strategy is pretty solid in neutering some of the more dangerous sweepers in RU. What's more, many powerful Trick Room pokemon are still in RU, such as some old solids like Slowking, Dusknoir, Smeargle, Cresellia, and Claydol, as well as some very powerful newcomers like Cofagrigus (who not only carries some excellent defenses and a punishing ability on switch in, but can also run both a Nasty Plot set like Slowking, or a Calm Mind Set like Slowbro) and Audino (who I find is excellent acting as a cleric as well; Regenerator is excellent for shuffling her around, and it can run wish and heal bell support as well).
One of the nice things about running a TR team in RU, that I have found, is that Trick Room stops a lot of the nasty, fast sweepers in the tier, leaving Durant, Yanmega, and Sharpedo (but especially Yanmega) on the wrong end of the sweeping stick. Dead countering those rapid sweepers is wonderful. My favorite TR sweeper may be Eelektross, who can maximize it's powerful mixed offense and unpredictable movepool. Think Octillary with better bulk and stronger physical offense.
Of course, Trick Room only works if you get off in time, but so far, it seems that taunt is moderately uncommon. Likewise, a lot of the strong sweeper options may be heading out of the tier. Rhyperior stands out as one of the more monstrous TR sweepers, but he is getting too popular in UU, and might be leaving us soon.
What about your thoughts on Trick Room in RU?