The only thing dynamic about dynamic queue is the inconsistency of skill level in matches.
I'm all for playing with friends but we had normals for that.
The skill disparity across different lanes makes match making meaningless. It does not reflect the actual ability of the individual player. This was the skill level across my latest game. I'm a mid silver player but low bronze and unranked players still get into my games thanks to dynamic queue, along with their higher elo buddy.
I'm sure everyone has a story about these games that usually just turn into one sided stompfests.
I urge Riot to consider tightening the MMR brackets needed to queue with people at the lower and higher league. The difference in skill levels lowest and highest percentiles of league is pretty massive. Having a game with someone from the lower 90% and 60% together make for one sided stomps.
Edit: Didn't think the image would so so huge on the boards and I don't know how to make it smaller.