I have no fond memories of Dragon Quest, myself (sorry @penguin_lx) . It seemed like a grindfest from game one. This was during the days when a lot of JRPGs were "walk two steps, random encounter, spam the resolution, gain XP, repeat forevarrr..." Rinse and repeat, no challenge, the basic strategy worked as you leveled up for everything ever in the game. If something new popped up (god forbid), you found the strategy that worked for IT, and then just spammed it over and over some more, ad nausium. Walking from point A to B to progress the plot took 1,000,000 "random" encounters against mostly the same enemies, mostly to grind (at first) or just to annoy your progress (after you leveled once or twice).
Maybe they improved it since the first gen exports? I know it was big in Japan at the time, and is still a thing, but never really got why. There was never any real challenge except for grinding. From what I understand, they were pretty faithful ports, which just raises more questions about it's popularity.
Sorry to be so down on DQ, a lot of people love it, I don't want to be a jerk to them. There are a lot of good qualities there, and maybe my initial impressions from the early games have tainted my viewpoint to the latter ones or the re-releases.
Maybe that whole thing works better on mobile.