If I'm playing by myself, it's usually a really bad experience, to be honest. I'm talking 8/10 times.
I usually bring a friend or a few along so if there's a bad random, we can at least kind of neutralize it. But this mode becomes really awful if you're playing with randoms against a coordinated 5 (I have been on both sides). They really should have a no-squad arena, and hopefully with good matchmaking so I'm not playing with some asshat who never gets a team grade higher than a C+