I originally got Birthright for the girl-on-girl, but after playing the game a bit, I was so thoroughly disgusted by their weeby culture that I actually bought Conquest and am playing that instead. I mean, come on, they even give you a bunch of ninja wannabees and a little pink-haired sister named Sakura who is a healer shrine maiden, REALLY?!
The gameplay is okay, it looks prettier than Awakening, the castle thing is cool, and the plot is pretty horrible. It's a fun game and I'll probably beat it, but it seems like they've just taken every single bit of fan service from previous fire emblems and crammed it all into a single game without regard for anything. A lot of the characters are basically just alternate versions of the popular Awakening characters (Owain/Odin, Tharja/Shara, Donnel/Mozu, etc)
Enjoying it, but it's also probably in the lower half of my list of favorite Fire Emblems, and I really hope they reign things in and streamline it a bit in upcoming games.
Also Birthright is cancer. Chapter 10 is cancer too.