FE Fates is a mixed bag. Conquest offers more challenge and more mature story. It's probably the best of the three. Birthright allows backtracking and unit grinding, so a lot of the enjoyment there is laxed team building. Revelations is so insanely terrible that it brought down the entire package for me. I enjoyed aspects of Fates, but it's clear why the FE community hold it to so much disdain.

My first Fire Emblem and largely my gateway into games with actual characters and storylines. Looking back, the writing was mostly nothing special, but I really enjoyed building up character supports. And I didn't really know what I was doing, but I guess the gameplay was engaging enough for me to play through all three routes to completion.