I've had so many ADC/Support relationship "issues" that I agree with those that label it an abusive relationship.
Heck, last night I played support 3 times and only one went very well from the start.
Game 1) I take Janna support, and end up with a Teemo as my "ADC." We faced a Jinx/Nautilus matchup. Teemo consistently misjudges Nautilus's range on his anchor and dies multiple times early as Jinx gets fed. We lose badly.
Game 2) I take Sona support with a Graves ADC. We faced an Ashe/Leona bot lane. Graves and I were on teamspeak together and ended up laughing at the situation as I went 10/2/28 and Graves went 28/6/14. The big issue was an Ashe who kept trying to trade after I had landed multiple Q attacks and a Leona who would use her Q to pull herself out of Ashe's auto-attack range and right next to both Graves and me. I have to admit it was a lot of fun for our side, but the other side's mid and top laner both got extremely "salty" about how their bot lane fed.
Game 3) I go Sona support again, but this time I'm stuck with another Teemo ADC. We faced a Caitlyn/Lulu combo. Teemo wasn't great, but he avoided dying. The bigger surprise was that the other team stayed in lane far too long. I just missed getting first blood when I noticed Caitlyn was down to less than 200 health so I flashed to her and hit Q (our midlaner died just before I got Caitlyn). I'd use that 2 more times, once only getting her to flash, and getting a second kill later. It was clearly a case of bad synergy for the other team. Once time Caitlyn returned to lane and Lulu immediately used her ult on Caitlyn. I responded by hitting my exhaust on Caitlyn and then Teemo and I proceeded to tear in Caitlyn right in range of our turret.
3 games, and in all 3 the bot lane was decided mostly on the synergy between the ADC and the Support. I've had other games recently that played out the same. One time I had a Sivir ADC who refused to trade and often retreated behind our turret after using her Q and W to partially clear a wave. We got bullied out of lane as I screamed at my computer screen cause there was little I could do to win the 1v2 poke-fest that was occurring.
I've come to the conclusion that ADC and Support are probably the two toughest positions because you have to be able to mesh with someone you've probably never played with before. My game 2 from last night is a wonderful example. the Graves I was playing with prefers to play top, but when he first started playing Graves I supported him through several games. We know how each other plays and when you add in the advantage of communication you get with teamspeak/Skype/curse voice, we can easily dominate a lane since we know what the other is going to do and why. It allows for more aggressive play without it being needlessly risky.
Not sure why I posted this, except to point out that there will always be communication issues with ADC/Support and its never going to be perfect. Especially in games where you don't enter with a preformed team.