Since I play on multiple platforms...I will list multiple games.
NES: Legend of the Ghost Lion - A rather interesting take on the RPG as you actually have to FIND levels to level up rather than grinding for levels. It encourages exploration and grinding is only needed for money. Granted it's a simplistic RPG, but I still had fun with it.
SNES: Final Fantasy Mystic Quest - Nthing this. While the gameplay was simple, it was still a fun game and a great way to kill a few minutes for those who like RPGs. Also...the Dark King's theme is still one of the most awesome themes in existance.
N64: Quest 64 - While it's a pain to try and build up your character, I love the very simple interface and the combat system is very good. Not a badly put together RPG, IMHO.
Gamecube: Megaman Network Transmission - It might not get much love due to...well, MMBN series not getting much love nowadays. Still, the way they merged elements of the MMBN series with the classic platforming of the original games was a delight to play.
Wii: Arc Rise Fantasia - Despite some repetative dialouge in the battles, this was a well put together game and I love the fact that the characters' weapons and abilities are very customizable.
Genesis: Phantasy Star III - It tends to get forgotten due to IV geting a lot of love, but I still love how well the game plays and the fact the characters you play as change depending on who you plan to marry.
PS1: Rhapsody - Okay...the kiddie theme and music was a little odd. Still...I love the battle system of this. It combines the best of both standard fast paced turn based battles and the placement mechanics of strategy based RPGs.
PS2: Rogue Galaxy - Nthing this as well. A great RPG...but what I thought was a great idea was using random drops from enemies to unlock abilities. That's a very unique way of using the "useless" drops from enemies.
Gameboy: Revelations the Demon Slayer - Kind of a weird little RPG. You can actually recruit monsters you meet, fuse them to make new ones, and even though the monsters don't gain levels there's still a lot of variety for customization.
GBA: Riviera the Promised Land - Hmmm...kinda weird trying to work with an item based mechanic, but the fact you have limited actions both in battles and on the map, it does make you think. A great game for more cerebral players.
DS: Nostalgia - Hmmm...rather like the idea of an RPG during the age of exploration. Choosing which abilities to focus on offers plenty of customization.
XBOX360: Lost Oddessy - I think this fell under the radar due to other titles, but I love how the feel of the main character works for this game.
Anyways...my 2 GP on this topic. BTW...you get no bonus points for figuring out what my favorite genre of game is.