I mostly watch romantic dramas and the main pairing is of crucial importance to me, so if the pairing I like doesn't end up together, I will probably drop the drama. There are some cases where, if I really want to finish that drama (because I'm stubborn like that), and if I don't ship the pairing that doesn't end up together that much, I might finish it. Also, the pairing also influences the overall view I have about said drama and the score I grant it. There are some dramas, however, that I really like, although the main pairing is absolutely disdainful for me, because the drama doesn't mostly focus on the pairing, but on the action, which makes it work for me. I'm not that picky when it comes to dramas, I just want a cathcy and interesting plot and a couple with great chemistry, is that so much to ask for?