I finished MOTHER for the first time last night. It's not a simple game, so reviewing it is going to take some time. I'll try to break it down into its component parts: exploration mechanics, battle mechanics, game flow, scenarios, story/writing, music, graphics, and how all of those elements fit together to make this game what it is.
As a courtesy to Jon Magram, though, first I'll attempt to sum the game up briefly:
MOTHER is a charming RPG despite frustrating mechanics. Patches mitigate some of those flaws. Starts slow, but ends beautifully. Awesome music. Recommended.