I've got mixed feelings about Conner/M'gann. I, too, prefer Conner with Cassie, but this is the show sticking with its guns and seeing a relationship from the beginning, so I'm good with the story development. At some level I would've been okay if in the second season they broke up the two and paired Conner and Cassie, but generally speaking I don't like that kind of pulling out the rug from underneath. Leave that for Dick Grayson and all his exes, haha.