Friends of Mineral Town and More Friends of Mineral Town are the best in the Harvest Moon series with it's characters!
The drawbacks are that you tend to run into rival cut-scenes when you don't want to and it's rather hard like the other handheld games to gain money. But I guess that's what you love about Harvest Moon. Holidays are also hard to find or figure out sometimes, which can make you miss out on some fun times and ways to gain hearts.
It will be hard to improve upon this great game, but I hope that in the future they will keep the classical elements and variety in their characters unlike what they did in A Wonderful Life and Another Wonderful Life.
Aside from that, Mineral Town is true classical masterpiece in the Harvest Moon franchise!