Allies "dominate" in 2v2 more than anything. Well, "dominate" is saying too much, it is by no means a foregone conclusion, but win ratios at the higher levels of play are definetly in their favour. I concur with you though that Cons could need a little love, still, con builds can be played very successfully in 1v1.
According to Legends data, Axis are doing extremely well in 2v2.
his/her data from 9-15-14 to 9-25-14 show that
Win ratios:
USSR: .546
USA: .560
OKW: .781
OST: .689
Source: http://community.companyofheroes.com/forum/company-of-heroes-2/coh-2-balance-feedback/106966-win-lose-ratio-from-15-9-25-9-2014-much-more
Unfortunately, his latest set of data (https://docs.google.com/spreadsheets...it?usp=sharing) does not include 3v3 or 2v2 win ratios, but Legends says that the data hasn't changed much. We can assume that the numbers have stayed relatively consistent.

People dropping in the first 30 seconds shouldn't punish their teammates with a loss/win as well