i'm going to copy/paste my review of conquest here:

not a lot in terms of story but the gameplay is nice, art direction and atmosphere is solid and some of the characters are great. it's not a masterpiece for sure but not as bad as some make it out to be.

birthright is simpler than conquest but has mostly the same strengths and weaknesses. overall i didn't love it but i didn't regret my time spent playing it either. conquest is definitely the better entry though