I also definitely prefer 2D. 3D otome games personally feel very "uncanny valley" to me, and the LI designs I've seen from those sorts of games tend to be much more homogenized than what is possible from 2D works. Even in 3D RPGs with romance elements it's hard for me to shut off my "this feels off" impulse.
I understand what some people get out of them (animations/more detailed representations of scenes, some sense of realism, etc) but it doesn't really gel with me so I don't seek them out. Who knows though, maybe one will eventually swing around that handles all of my issues, I won't completely write the possibility off.