There can. But the reality is that it is extremely unlikely... [shortened]
In the end it's not fun and just frustrating.
Of course there is always "lol just play 1on1 noob", but why does RT even exist then? To provide the stomping grounds for AT?
As an avid player of Random Teams (my friends mostly like shooters and my time restrictions make it hard to play with other people I know even casually) I feel that, while it's entirely possible to have excellent 2v2s with random teammates, it's more often that arranged teams (often you'll see people with clan tags in their steam usernames teaming together) will just stomp you and your random ally simply through coordination. In many cases, it's obvious that the AT you're against has a plan in place, and tactics which
require planning and coordination to pull off are more common when facing ATs.
All that to say, i do think that, if the population supports it, it would be better to have arranged teams either have their own queue or at least preferentially matched against other ATs. It's possible that RTs can beat/outperform ATs, but it's IMHO much more likely that the AT will walk all over the RT.
In short, my experience matches Raw's from the post I'm quoting.