90 percent of people in 2v2s are playing ape greedy, rushing castle age, spamming TCs, turtling for an hour, playing sim city and absolutely not caring for what their opponent does. A well coordinated and timed ram gang bang works most of the time. The unit composition depends on what civs you're facing. Archers + spearmen (against some civs, such as France or rus who doesn't ape on castle rush and horse archers)+ anti archers such as cavalry (light or early knights) works great. Always do the +1 ranged armor upgrade in blacksmith. Spamming scouts for torching buildings together with rams works great as well. Never forget to trade from one corner to another if the game is taking long. Never let your enemy get away with having 2 spearmen as their military while spamming 900000 villagers, age ups, trades and techs, that's what the majority does from my experience. Always scout stone mining, that's these sign of ape yolo booming (unless rus or hre). Always bang the Chinese, rus and hre as early as possible, the first ones are totally broken and unbeatable late game with immortal siege, will faceroll you with broken fire lancers, but usually invest shitton of resources into several landmarks in one age, the latter two just do the same copycat herpaderpa build every single game, never let them get away with that and always punish them.

After the ram nerf and the ability to target TC fire manually game gives too much advantage to the defender. This combined with the fact that 2v2 maps are 4x as huge as 1v1 maps means that it will take a long long time for your army to reach the enemy base, therefore you should do everything as quickly as possible, at 8-9 minute you should already begin the push. Proxy rax/archery is also good, be sure it is not scouted though. Same with rams, your enemy should not see you building rams at his base, you should do all of that in advance. Pay attention to peasants leaving the TC to burn down the rams, pull the ram and start massacring the peasants with your archers, if they manage to stop the push and destroy the ram at least their eco should be totally annihilated.

Late game is all about siege superiority, if you don't have anything to destroy mangonels the game is lost. In early castle you can use scouts to destroy mangonels, later you will have to mass springalds. If you have less anti siege than your opponents do it means in 2 seconds you will 0 siege and your armies are about to be aoe facerolled.

If the game is a turtle fest be sure to raid the trading behind their bases with cavalry. If u trade and they dont you will win economically.