Most improved sequels

[-Ack!-]

- Heroes of Might & Magic III
- The Elders Scrolls III: Morrowind
- GTA V
- Ratchet & Clank: Going Commando
- Resident Evil 4
- Rayman 2: The Great Escape
- Tekken 3
- Call of Duty 4: Modern Warfare
- Prince of Persia: Warrior Within

Maybe that's enough for now...