Most weeks, I've run 2's as one person with another person playing the other toon.

Even playing 5x8 = 40 games...
That can sometimes be faster or less painful than playing 5's.
Less so now, but a lot more so when I was gearing up.

Today in 5's, I needed four more wins.
And got the same 5's team (500 rating higher than mine) five times out of six games.
Even with a 20 min and 15 min break between queue times.
Decided to go back to 2's to cap for the week; the DK's ran 15W, 0L... while the Pally went 3W and 2L, in 2's.

For the most part, now that I'm semi-geared...
5's is pretty good; I win roughly 50% of the games against double healer and 90% of the games against solo healer comps.
So close to a 2W in 3 Games Played now.

But 2's is a lot more fun than 5's.

My team started arena mid-season.
About 4 weeks in or so.
And missed the TB exploit, for full honor gear that most of the others had.
So I actually payed gold per win, and finally found a frost mage that could carry my team.
Once I got the Conquest 2 Hander, did not need to be carried, but that was 2 full weeks and part of the 3rd.

I have a macro on each toon.
/2 Frost DK with 3641 Res, seeks 2's partner for Conquest Points.
Or whatever the Res is.
I usually end up running a lot more 2's games then the cap, just because they're fun if you get a half decent partner.
Plus its nice to return the favor... help someone relatively less geared get wins; I've had several partners who dinged 85 that day, and it is seldom more than 15 games to get them 8 wins in 2's.

Don't quite have Hot Streak on all the DK's yet.