I wanted a place to discuss this specific combo, but was unable to find any discussions going.
I would like to both hear from others playing this combo or people facing this combo.

But lets start with my experience.

I play with an IRL friend and we have just reached 1850 2v2 Rating. Our general losses come from my friend dying very fast, if we dont have a CD ready. Ill give examples when i go through the combo's.

Here is the combo's we face and how it usually goes.

Rogue & Priest
This feels like one of the easier setups. Almost an autowin for us.
I tank the rogue in Frost Presence, focusing on using Death Strike to heal myself, Plague strike to root the Rogue and keep Frost Runes ready to Chain the priest or Rogue, if either try to go for the druid.
Death Grib is used to grab the priest if he is about to manaburn.
If he does AoE Fear, i trinket or go Lichborne and grib him, before he burns my druid.

Eventually the priest runs out of mana, and the rogue dies.
Ring of Valor screws us over pretty bad, because the rogue can often start on the druid and the druid cannot LoS the priest.

Retribution Paladin & Shaman
This is probably our hardest matchup. The constant disease cleansing, Freedom, Water shield means that i cannot run the shaman oom, my damage is gimped and the paladin will get dps time on the druid whenever freedom is up.
The problem here is that my druid can gib in the few seconds the paladin is on him.
I try to save Death Grib to grib the paladin, when he has freedom, but Grounding sometimes ruins this and sometimes its LoS to paladin.

Our tactic is to go for the Shaman, run him oom and then kill. I don't see how i can burst either down, and the oom- tactic isnt working either.
Anyone got any ideas?

Resto Druid & Warrior
This feet like a Matchup in our favor, but climbing in rating, we have begun to go 50/50.
The tactic is to stay on the druid and CC the warrior. Chains, Grib, Roots, Cyclone. Run the druid oom and kill.
Problem is that my druid sometimes gibs when the warrior does hamstring + whirlwind.
Im hoping that better gear on my druid will solve this Matchup.

Rogue & Mage
Feels like this should be in our favor.
I do the whole fight in Frost Presence. I focus the Rogue, peel with grib, root with chain and silence the mage.
I use Lichborne asap to prevent polymorph.
When my druid get some more pvp gear. i expect this matchup to favor us even more.

Priest & Hunter
We have faced this a few times, but because it was such a bad combo for us, i still remember it.
Our plan was to focus the priest, prevent the manaburns and just outheal the hunter dps + mortal strike.
We won our games, but it was very very close.
Not sure what would be the better tactic.

The mage/rogue teams are basically a free win for my team right now but we are actually running frostdk/tree team. My partner (the dk), hits cooldowns and they cant kill him, and usually the rogue ends up dying to thorns half the time. Make sure you are running up the SP for thorns and if the druid has it talented it will hit for more than 500 every time which totally screws over rogues. Also have your druid start out in tree form or in cat form until you see if there is any stealthers or not. The rogue cant sap elementals and sheep doesnt do much either. That leaves them to try to burst the DK where his frost spec comes in handy and i dont think we have lost to a mage/rog team yet. I am not sure if unholy has any defensive cooldowns like the frost does so im not sure if this tactic will work as well for you.

Mage & Rogue
We dont have problems with them focusing me, the dk. The problem is that they focus and often kill my druid. After that i need to kill them.
about 30% of the time, They arent able to kill the druid and its an easy win.
about 40% of the time, the druid dies, but the rogue also dies and its 1v1 with me vs mage.
and about 29% of the time, they kill the druid and i die 1v2.
and the last 1% is where i win the 1v2

But this fight im sure will get easier for us, once my druid gets better gear.

How is the druid specced? glyphed and talented barkskin is basically a 12 second iwin button for us now. abolish poison>anything else against a rogue. i am wearing all hateful/titan gear and rogues are soooo easy now as long as i keep abolish poison up and hotting constantly.