Played a 3 reg vs 3 TB the other day. The TB side got destroyed. This is with 2 of TB team on LAN as well.
I will kind of run it down of how it went. (it was on Leviathan)
In the begining, I knew we were going to get sniped, so we focus immediately on armor and hp equip.
The match start, the moment we got near flag where creeps are, we got sniped and force to retreat as they chase us. We did tried to fight in the begining, but did nothing but getting us killed by repeated snipe from all of them as soon as they recharge. Even their normal damage alone can force us to retreat.
The flag is automatically theirs. Me and my LAN partner went for flag capping spree to avoid free kills (avoided anywhere they are), unfortunately our other partner wasnt so coordinated (fed them 10 deaths total).
The regulus completely dominate those towers which our TB range can do nothing about aside to try to get as much level as possible for a final stand.
They pushed into our base from 3 sides, middle, left and right easily, because we simply cant put up a fight for more than 5 sec before getting snipe by all of them and forced to retreat.
Once they pushed in, thats where it got tough for them as they are much closer to each other. Me and my partner were able to score 3 kills total while 4 deaths between 2 of us. Their better regulus player didnt die a single time the entire game. I assume he also got tons of hp equip as he was the main killer of our 3rd partner.
We had 2 fire TB and 1 ice (i am the ice).
Due to them having so many creeps upgrades, we were leveling quite fast in the end. 2~4 levels higher, but we still lost with our citadel dead. We can't push out because we had to rush back to health point or spend a fortune on potion due to snipe. When we are in our base, the health stone was close; hence less snipe problem.
As for the mines, at later game we basically can't get near flag without getting smokes in our face then came with the snipe.
Conclusion is that TB vs reg is a horrible match up. (which we all knew before the match even start)
I think snipes biggest problem is how everything (creeps, flags) have such huge LoS, so there was no way that you can do something that matter without getting snipe then forced to retreat with them chasing you.