Legend of Dragoon deserves something, dev's world on that has been remained stagnant.
LoD2 was actually in production for over a year, with solid progress made, before Sony came along & said "Lol no" and shut the project down.
According to an interview last year with EGM (I believe), the director states that the LoD2 team still gets back together from time to time to reminisce on what would/could have been. Considering it's been a decade, it sounds like either total BS, or Sony drop-kicked to the curb a fantastic title.
I'll agree with the Dante's Inferno someone already said. Another one I've played that NEEDS a sequel is Split/Second. It is very unlikely since I remember reading that Black Rock shut down a few years back