Ridiculous writing (spoiler alert if you haven't seen the last episode)
(SPOILER ALERT) I hung in there through every episode of Mercy. I so wanted it to be good. But the cliffhanger end was so ridiculous I didn't ever want to watch it again, even to find out what happened with Chloe and Briggs! Veronica has TWO love interests, and while she's relaxing in the tub we find out one of them could have died in a plane crash.. and the other one could be killed for rescuing a girl from punks. Seriously????
Viewers today are tired of being strung along by these ridiculous ways of keeping our hero and heroine apart. You can get them together and still survive as a show. Meredith and McDreamy proved that.