Probably the most complete, fun, and imaginative RPG's I've ever played come in this pack. Returning Might and Magic fans need not read any further - they know what they're getting with this package. For first time players, 4 & 5 are the best starting points for this series. The graphics have aged the best among these two, the games combine into one giant world, and it interface is straightforward.
Don't let the daunting task of starting a game and not knowing what the heck to do. Walk forward, use "s" to shoot your long ranged crossbow at the slime, "a" to attack him when he is upon you, and after you defeat it go to the tent ahead of you and get your first in-game quest. Take a few moments to learn the short cut keys, go over the inventory system, and then let the game take over.
Might and Magic 6, although not as immune to time as 4 & 5 are, is still a great, great game in the same vein as 4 & 5.