A little bump to this thread comes from this:
Famitsu - 'Greatest Games of All-Time' list by readers1.Monster Hunter Freedom Unite (PSP)
2.Dragon Quest IX: Sentinels of the Starry Skies (DS)
3.Final Fantasy XIII (PS3/360)
4.Final Fantasy X (PS2)
5.Shin Megami Tensei: Persona 4 (PS2)
6.Final Fantasy VII (PS)
7.Tales of Vesperia (PS3/360)
8.Xenogears (PS)
9.Monster Hunter Tri (Wii)
10.Metal Gear Solid 4: Guns of the Patriots (PS3)
11.Machi (SS)
12.Yakuza 4 (PS3)
13.Tales of the Abyss (PS2)
14.Dragon Quest VIII: Journey of the Cursed King (PS2)
15.Okami (PS2)
16.Resident Evil 5 (PS3/360)
17.Kingdom Hearts: Birth by Sleep (PSP)
18.Tales of Graces (Wii)
19.New Super Mario Bros. Wii (Wii)
20.Tactics Ogre: Let Us Cling Together (SNES/PS)
Why would I put it in the RPG thread ? Well, considering more than half of the list are RPGs that's fair enough.
Oh, and this list is voted by readers, so we don't need to take into consideration the huge amounts of money famitsu probably charges for most of their reviews these days.