Been surfing Archon after falling out of Oracle since the start of the patch. After 650ish hours, I'm pretty confident in saying that you can't rank as a solo queuer unless your hitting the 777 multiple times in a row. Every other game even at this relatively higher rank has people abandoning during the laning phase, or the nature of a 6v6 vs a 5v5 moba means one person on a streak cannot easily carry the dullards.
That's not to say that the enemy doesn't throw their leads, or that it's impossible to play from behind, or that a single player cant make all the difference on a teamfight or rejuv steal because that's clearly not true. But sometimes there is just no amount of early leads that make up for the people behind the keyboards. Things would be much easier if people who know they aren't going to make an impact just buy disables instead since those "Cant" miss and can be safely used from the backline.