Earthbound is eternally on my list of games i play through every couple of years. Its such a great game. Some aspects of it are a tad clunky by modern sensibilities (inventory management, going through the menus for a lot of things, etc.), but overall it holds up really well. Also if you liked earthbound, mother 3 is also 100% worth playing. Mother 1 (or beginnings, or whatever you wanna call it), is hard to recommend to anyone but the most diehard fans, though.
I like earthbound the most of all of em, but thats purely for nostalgia reasons. From a critical perspective, i think mother 3 is the superior game.