My problems with OQ romance... 

My main problem with OQ is its fans. Mostly on tumblr though, not here. They say they want Maid Marion to die just so OQ can be canon which is sick. She has a 4 year old son. They also sometimes just focus on OQ in a certain episode. Like the episode they kissed, that's all they'll talk about on their blog.

I'm not an OQ shipper by any means (I find it cute, but that's it. I'd pick Robin/Marian over it anyday), but to be fair, OQ are far from the only shippers guilty of this.
Oh, and OQ is already canon. When both parties of a ship are confirmed to have feelings for each other, it's canon. The only thing they aren't (yet) is endgame.