Mine (will include spin-offs)
Red Dead Redemption (don't get me wrong, the first game was decent but Redemption gave it a larger, much less linear world).
Majoras Mask (fuck you OP, was better than OOT)
Diablo II (I agree, I never played original but was fantastic)
Little Big Adventure 2 (the original had charm and was awesome but LBA2 is one of the greatest games ever)
The Elder Scrolls IV Oblivion (even Skyrim has nothing on this)
Heroes of Might & Magic III (best in the series, simple as)
GTA Liberty City Stories (my favourite in the entire series which I've played extensively)
Final Fantasy Crisis Core (never been one for FF games but this was everything the series needed to be)
Fable II (loved it to bits in spite of mixed responses)
Harry Potter & The Chamber of Secrets (loved it on 5 different consoles, the best film tie in game of all time)