In the interest of fairness, I never played Earthbound, so I probably don't have the same emotional attachment to the series as many others do.
And no, I don't intend on playing Earthbound any time soon. The last time I was convinced to play through a classic game to confirm my gamer cred, I ended up nearly throwing my Wavebird controller through the screen during Ocarina of Time's Water Temple. I'm not suggesting Earthbound (or anything) could be as awful as the Water Temple, but the experience taught me to care less about "gamer cred" and more about what I find fun.
Nevertheless, I'm sure Mother 3 is a very enjoyable experience for a lot of people. Just...not me.