You shouldn't really say a post like that until you've played them all to make such a post. XD The third one will need excessive grinding especially near the end and after the game if you choose to continue. XDI've never really felt the need to grind in either series, personally. That said, I've only played through the first M&L game, not the sequels.
The first and second game is rather moderate.
I'm surprised you didn't play the 2nd and 3rd one (especially the 3rd one.) . XD