As a TB I can understand your frustration. RoI is nice but it's not high enough damage to be a real tower killer unless they're all stacked up and moving in for deep freeze or fire AoE is risky with boulder roll. That being said, I had excellent support on the finishers all through the last 1/2-2/3 of the game. Early on my teammates didn't do so well but they only died a few times, maybe 1-2 times a piece which was really only a 2k'ish gold swing in your favor, spread out over your team if I remember correctly.
I think what compouned things were a handful of mistakes on your EB's part and the lack of a second anti-building AoE character. You were the only one who could really start to dent the tower forest without taking major damage and there were some critical moments that I really think the game swung in our favor.
For example there was a point at your gold mine where I had between 7 and 10 towers and EB used bat swarm to enter combat, warping behind my towers over to me. However he was in range of at least four towers when he started that fight and I just walked back into the pack, which allowed you to hit me hit me but because he'd used swarm already he had to walk away from combat early which caused all my towers to focus on you and I was able to boulder roll and trap you for a kill. He then got picked off by EB and I think an additional assist from Oak, and that particular series of events all started from his tendency to initiate combat with a critical escape move.
Also he didn't get mist which was a major disadvantage against spit and hammer slam (at least until I get rank 2 boulder roll, but I don't get that until level 13). I mention all the things I felt EB did wrong because between UB, EB, and TB I find a well played EB to be the most challenging. The minion swarms scale up fairly well against towers of light and it's very difficult to ever land a kill between swarms and mist. It just seemed like he was imitating half a strat he'd seen... I got the feeling he'd seen a strong EB player warping into a fight and wailing on people but didn't see that player mist and wait out his swarm cooldown to escape because nothing forced him to.
As for TB vs. rook as I said it's clearly not an easy fight, but you've gotta realize I use Staff of Renewal as my favor item and there's two cooldown flags on that map (though I think we only held one for the majority of the fight). My playstyle depends on fast towers, frequent slams, and boulders to trap people who chase, and it falls apart when shatter is used on me 4-6 seconds after I build a tower, as it effectively doubles the cooldown of the ability and undoes what I've designed my build around. I don't remember you shattering frequently if ever. Also I use HoL (and still will after the nerf I'm sure) and deep freeze prevents the usage of that for its duration as well.
Lastly your UB was on the other side of the map in the early game. Without Blood of the Fallen spit spam can keep me tethered to our corner tower, as the ones I build aren't sufficient to ward him off before level 4 and I have no way to push him back until level 5. I'm not saying you all three should have been attacking me, just that your early game lane assignments didn't pressure me. A stalemate with UB while the other two guys farmed my partners who were giving you early kills might have given you a bigger edge that I couldn't have overcome.
On some level you may be right though. I play rook because I don't know how to beat him and I like to see what methods people use, and generally (though certainly not always) it's only double and triple teaming that works against me. I don't know if that says more about my skill, their skill, or rook's fairness.
Lastly though I think you underestimated my partners that game. I don't remember their names (and it doesn't look like the game was logged) so I can't look them up, but they really did get a lot of finishers. The fights may have started off 2v1, but after you guys got a couple kills on me I whined like a little baby and they started saving my ass over and over. I think I had the most kills in the end because hammer slam eventually gets batshit insane, but in the midgame when the game was decided I'm pretty certain I was behind my partners or at least neck and neck with them.