Considering Dual Boxing 2v2. Can you help me out with some basic question?

[Fat Tire]

I tried to do SHM/DK/WAR last season in 3s. It was horrible. The number of CCs out ensured that I had zero chance of winning in a good bracket. My brain literally shut down trying to process all of it.

Same here. I dont have the ability to play more than 2 types of classes at the same time. I can play 3 decently in pvp but 2 of them have to be the same class.

JellyRawls - I treat 2s as practice for 3s. 2s are not competitive at all as illustrated by heyaz's post. So have fun, try out new things, try all the comps you want and find what is fun to you, refine your macros, gather arena awareness and hit your point cap while your at it.