This is not a serious question it it?
* Mana series does not even have a fraction of the popularity of Final Fantasy. The Final Fantasy you are comparing it to is just not any ole Final Fantasy.
* Mana had string of releases and... they were all meh to terrible. Children of Mana being the worst. I'll be real, that is the reason I have yet to pick up the game. Legend of Mana is the last excellent Mana game.
* There is nothing spectacular about the presentation. Very budget. Its not bad but I would not praise it. We have B class developers like Gust and compile Heart putting out more visual impression games.