Sorry to be a bother, but let's talk about some of the retro role-playing games that aren't so mainstream. In other words, the other role-playing games that feels very underrated!
I may be mistaken, but that's not what underrated means. An underrated game is one that gets more hate than it deserves. Just because a game seems to fall out of the mainstream and into obscurity, it doesn't make it underrated. Illusion of Gaia got good reviews, and even overtook Soul Blazer for amount of carts sold.
But anyway, I'm probably going to go with Pokemon Diamond and Pearl. They're solid games and got good reviews, but they run really slowly and a few fans have been turned off due to this. Thank goodness it was fixed in Platinum.