I've only played III and Revenant Wings, I'm very impressed with what Square Enix is doing on the DS (also got Dragon Quest IV). III was well done as an NES-style game (not just a remake). I liked Revenant Wings a little better. RTS and RPGs are my favorite genres, and I really felt they hit it out the park with the combination, something which could easily have been bad or quirky.

The only problem for the audience is that not every SE fan is used to the genre or its underlying mechanics, so I think not everyone was into it, I know alot of members here found it very difficult.