Those Reuniclus vs T-tar calcs are pretty useless. Most T-Tar are running special defensive investments and ass vest is a very popular item for him.
I think one of the posts on the first page by Lee is really important to understanding how to make a successful tr team.
Stealth Rock is a serious problem, as Lee said, because it's so hard to find the time to set it. I know this is kinda blasphemous, but maybe it's more of a detriment to try and fit a viable SR setter on a Trick Room team than it is to use another poke that adds offensive/defensive merit to the team. There are very few SR setters that I would want to run on a trick room team and starts to pigeon hole you.
A serious lack of good offensive setters is tough on most teams, and worse yet is the difficulty most setters have in creating momentum once TR is up. I'm very interested in looking into setters and sweepers that have access to volt-turn, easing prediction and giving setters more safe switch ins to activate another room.
So far Whimsicott has proven very interesting, even after I slapped myself on the forehead for forgetting TR's -7 priority. Encore is a great way to regain momentum, and memento gives a suicide option to give maximum turns under TR for a sweep when whimsi has gotten low enough on health to no longer be of use. What i love the most is that u-turn. Against offensive teams you get a fast u-turn under TR to scurry away and take the hit better and against slower teams you get the "slow" turn under TR giving something a free switch. Grass/Fairy also provides some pretty nice resistances for a TR team, and the weaknesses are pretty easy to pray upon with common trick room abusers.
I think part of the problem with TR is that it's getting very predictable in what each pokemon is going to use. Finding new pokemon that mesh with existing methods of using TR seems extremely important to me in terms of pushing TR's success. One thought I've had is to push the boundaries on the speed tiers thought needed to be a good TR abuser. I'm looking into pokemon in the base 80-100 range. What this allows are pokemon that are still typically out sped by most aggressive pokemon, but have the speed to beat most defensive pokemon outside of TR. This could allow for more flexible play against the defensive teams TR teams struggle against the most. Pokemon like Kyurem-B (who is one of the best pokemon against defensive cores right now, and has the bulk to take mach punch/bullet punch even without hp investment), Darmanitan (I drool at Life Orb+Sheer Force, and a very useful u-turn), Krookodile(moxie is an awesome ability to have under TR), Mamoswine (maybe not the best idea since it's pooped on by every priority move, but ground/ice stab is so deadly) are very interesting to me.
And what about trappers? okay dugtrio is out for some very obvious reasons, but Magnezone and Gothitelle have the right speed. Not allowing double switches seems wonderful for maintaining momentum under TR.
Mixed attacking, and surprise coverage are what I've had the most success with for softening up a team in the middle game. Things like mega-heracross are great under TR, but can't lure for shit. Mixed Kecleon with ice beam/fire blast to take care of common physical walls has brought me a surprising amount of success. Anyone have some good mixed attackers not mentioned in the OP that have been working for them? IMO lures with strong coverage are key to TR's success, more than any other play style because of how much momentum you need to maintain.
Sorry this is a bit all over the place, I just got excited to post about TR. I love the style even with all of its faults