In light of the EXP adjustments made to solo queues in 2.15, it has become much more efficient to queue solo, almost regardless of what your win ratio ends up as.

A sample size of 100 matches in a 3-man queue, with a 100% win rate, will yield about 3,000 experience. That means winning all 100 games you play.

If you do the same number of matches in solo queue and win a mere 25 out of 100, you'll gain the same amount.

With that being said, if you're able to muster up a 50% or even 60% win rate in solo queue, you'll end up with tons more EXP and marks overall.

So please, stop queuing 3 mans and collecting your relatively easy wins. You're not getting as much out of a match in the long run, and you're hindering others from a fair chance at victory. You also free up spaces in solo queues by doing this, effectively hastening matchmaking... hopefully D: