Graphics are dated, but the gameplay can't be beat! Having real time AND turn-based means all ability levels can play.
1) In other games, I sometimes felt as if I were slogging through a level. In MM6, something is always happening. One goes up in level quite often, so there are new spells or better skills or new weapons or more armor or some goodie or the other every time you turn around. Most of the monsters have a least a couple of goldpieces, so nearly every critter killed gives you something. This makes the game very addictive -- just get one more level, and you can get that skill you want; just kill five more monsters and you can afford that armor. What? It's 4 a.m.?
2) One can play battles in real time or in turn-based mode. I have truly miserable hand-eye coordination, and many video games are simply too hard for me and thus not fun. This game lets the dexterous play in real time, but the turn-based option lets those of us who are nondexterous play, too. I wish every game had a turn-based option! Also in this vein, you use your characters' skills to attack monsters, not your own, so you don't have to line up a blow with a sword or an arrow from a bow or a fireball from a wizard -- you just tell your charcters whom you want them to attack, and they figure it out. You figure the strategy; your characters handle the hand-eye coordination. That's why they're the adventurers, and you're sitting at a computer. :-)
3) The party is large enough that one gets to take advantage of several different types of skills -- you can have a fighter, a mage, a cleric, AND an archer -- but they move as a unit, so the game doesn't descend into the chaos that some other RPG's do.
4) Many recent RPG's seem to be so concerned with realism that they've sacrificed gameplay -- just as one example, I've played RPG's where archers are always having to run back to town to buy more arrows, even if they buy 500 at a time. In MM6, there's some concern with realism but more concern with gameplay. If you have a bow, it's assumed that you have arrows to go with it -- you never have to buy any. There are some space limitations, but no weight limitations, so if it fits in your space allotment, you can carry it.
5) The Mandate Mania website (run by a fan, not the official site) is one of the most helpful game websites I've ever seen. They give LOTS of information, and it's very well organized.
6) I could go on and on, but this is long enough. :-) The game is fun and charming, reasonably easy without being dull, and has lots of skills, quests, places, and items.