I prefer the earlier stuff too, but not straight across the board. There are some early things that I don't love at all, but they tend to be in the minority. I basically love the more "innocent" period, the melodies, the harmony vocals, and just the nostalgia of it. The songs that weren't overplayed quite so much are the ones I tend to appreciate the most these days.
I also love a lot of the mid-period stuff, and some of the later stuff, but my batting average is highest with the earlier stuff in general. I and my brothers bought every LP as they were released, and the early stuff (what I consider the best of it, that is) still hits me to this day. The "Hard Days Night" soundtrack may be my favorite album, although "And Your Bird Can Sing" is probably my favorite individual song. Hard to generalize. I don't care nearly as much for the more psychedelic stuff, the India-influenced stuff, etc.