Currently playing through Baldur's Gate 2 for the thousandth time, best game ever made! Last new (to me) RPG I played, other than Skyrim, was Planescape Torment... god there were some amazing games made on the infinity engine!
Weird how some RPGs I loved at the time (Off the top of my head; Mass Effect games, Elder Scrolls games, The Witcher) I can't go back without becoming incredibly bored, incredibly quickly, whereas some others (e.g. BG, Neverwinter Nights, Kotor, Dragon Age: Origins to a lesser extent) I've played loads, some dozens of times since they were released!