Really really really fun and addicting... a personal favorite...
Most people have played this game by now, but if you haven't, some reviewers suggest the extreme linear nature of the game (the original game came with a free strategy guide) and the cartoony, even primitive graphics. When I first played the game, it was post-Chrono Trigger, post-FF3, Post-SoM, yet I wasn't turned off by the graphics. I liked the brightness of the game, it added a unique personality too it that was perfectly complimented by the quirky music and sounds.
Earthbound was great for its simplicity. It's the king of the linear RPGs in my opinion. It's a great game for "Checklisters" who have to do everything a game has to offer before they can stow it away, because the game itself pretty much assures you that you'll get 90% of it done just from playing. The other 10% is the few extra opportunities, like buying a house, or finding the Sword of Kings, trying to get every photo-op possible, etc.
This is by far one of my favorite games to restart and replay over and over. I don't know why. Some people criticized the leveling system, saying it's too easy, but I love it. It's great that you can become very powerful with a little elbow grease and hard work. It's quite rewarding to walk up to an enemy and beat them by default without even going into battle, if your stats are that much higher than theirs. This is something I wish more games imitated.
Anyway, that's my take on it. Hope you all agree.