I guess I am fine without the job system, because I like IV and V as well and that did not have a job system.
I think what I miss is the number of playable characters in the game, and the diversity that brings. VIII surely only had 4 main characters, and stuck with them from beginning to end. In V it was great because you can collect whatever monster you want (well, a selection that can be caught anyway). VI had like 8 (my memory is fading), and VII also had about 8 (damn, I don't remember as much as I thought I do).
4 characters for me is just a little too shallow. I mean, that's going back to DQII when there is that limited number of characters.
EDIT: Anyway! Let's bring this topic back on track. I don't mind replaying IV for the 4th time at all (played twice on NES, once on PS1), and I have not replayed DQV at all so that would be a treat for me (haven't played the PS2 one yet, still sitting in my box of backlogs). DQVI will be awesome as well, as I haven't touched that game since I finish the copy that I bought the game on the first day for over HK$780.00!!!