Yelo! A well known by all topic I came here to discuss:
Blizzard, you guys have to choose: either make class balance decent or make a separate solo random battleground q where you cannot join as a group. Both premades and broken specs are simply too much to deal with as a combo.
No matter if its a full premade, a 5man or whatever in between: once there is an advantage where people can use discord and fine tune their team with 3 priests, shamans, boomkins or “insert any class/spec you think is op atm”, the gameplay just becomes trivial for that team. Ive done nothing but rep grinding for several days now and boi! Maybe on 5 times out of 100 we were actually able to win against a premade as a group of randoms. It is just a perfect way to cheat the system really and one faction of the two almost never uses solo q for this specific reason. Am i wrong? I would love to see some stats then.
You can adjust the chance to meet groups in battlegrounds all you want, but if those premades are pretty much the only option, it would happen anyway.
And I mean, have your interns even checked what kind of burst shamans and shadow priests can put on a team, even with 1-2 healers available? Hell, if targeting is even remotely good, there isn’t a healer good enough on this planet. A tank bear druid in full BiS getting completely smacked down by a shaman is perhaps a step too far, no? To do same damage rogue, per example, should learn how to play piano and use all consumables available in the game and those fellas just 2hit things 
Before people start pointing at any other classes or specs, my point is mostly about the premades. Even tho some specs are broken atm, losing to a team full of random chads simply feels this much better.