Dragon Quest IV is one of my favorite games in the series. I'm only familiar with the Playstation and Nintendo DS version though. Akira Toriyama's artwork is even more prominent here. I'm writing this almost a year after I played the Nintendo DS game, so memory isn't all too fresh and, to be honest, there's not much to say about it after having played Dragon Quest III.
As far as gameplay goes, there isn't much to add since the games added very little with every addition to the franchise. The Nintendo DS version looks pretty neat, and people familiar later entries will find certain game elements that they should be familiar with. For example the hidden coins that let you receive a reward for delivering a certain amount to a NPC.
