At around 1995, we had a magazine series that brought top games for incredibly low prices called "Bestseller Games". When they had Might & Magic IV and Might & Magic V in two issues, my father brought it to me and we installed it. He said it is a great game, showed me the basics and we played a bit but I didn't like it much at first. The interface was a bit too complicated to me. However, when we went through Vertigo, killed some slimes, got to a wish fountain and I learnt about the skills (of which many seemed useless to me until I found a description about a few years ago) and shops it became much better. Then we accepted quests and did some. The characters got exhausted at some point and needed rest which refilled hitpoints and magic. One shop sold magic, another one weapons. Sometimes items were hidden somewhere. Well, in short: I got sucked into the game. So much that I can say now, I was done with it when I finally beat the worst of all monsters on the World of Xeen. It plagued me for years that I was able to win the game easily but had no way to defeat this monster that (spoiler) was still alive at the sky roads above the castle of Sheltem. Until I finally beat it, more than ten years after I won the game, in 2007. Of course after winning the game and playing through it a few more times in the following years I didn't play it often but it still bothered me. Now I can say, I beat Might & Magic: World of Xeen. Might & Magic III played much like WOX but with slightly worse interface and animations running too fast (thankfully this has no influence on the turn-based movement and combat). Eventually, I also beat it.
On christmas 1998, I got Might & Magic VII and it was quite a fun game but it didn't feel the same anymore. Personally, I think the change to 3D with all consequences, with the new engine (used from MM6 to MM8) was debatable while MM9 is not much Might & Magic anymore but instead an RPG with a few puns that doesn't play very well but would still be a good game without the bug that the arena crashes. However, part 1 to 5 belong to the classics of turn based RPGs and at least part 3 to 5 are highly enjoyable. Part 6 uses the 3D engine and is quite fun but the graphics are horrible (those of 7 were the best of the three games that use that engine). I played part 1 as well and one must get used to it but then it seems quite good also except for the high difficulty. One however needs to write the maps down or use maps from the internet since there's no automap feature. I didn't play part 2 much yet.
If you like classical RPGs, buy this and you'll love part 3 to 5. You also may want to give part 6 a shot, but expect it to be different than the first five parts. It won't feel like a real Might & Magic when you first play it. Treat it as a bonus game, see if you like it and if not, stick to the at least weeks of fun with the other games.
Just a bit about the game mechanics at the end. You walk around, gain experience and get levels when you train in certain buildings found in each town (training halls). Levels make you better. You sometimes find stat-enhancing things that either give permanent or temporary status enhancements. You can create own characters in taverns or can go with the good-balanced starting group. For challenges you could try a party with only spellcasters or only fighters, without a thief. Certain (optional) things need certain stats. For example, opening boxes needs a certain might.
Everything is turn-based, you can stand two fields away from a monster and shoot arrows or magic at it and it will move one field towards you if it isn't defeated yet. On the other hand, a few monsters also can shoot magic at you. For the most of the game, one will go into melee combat and beat the monsters with his X moves per turn (that increase with levels and essentially give additional damage that is calculated when one uses a melee weapon).
Well, best is you find out for yourself why Might & Magic once was one of the greatest RPG series, named in one row with Ultima and Wizardry, before it became 3D. Personally I didn't play Ultima (except part 1) and Wizardry, though.
My impression:
Graphics: Well, see the screenshots. Either you like it or you hate it. I like it because it's comic-like without looking like a comic. Overall 7/10, with part 3 to 5 being the best
Sound: Nothing special. Overall 5/10, with part 6 being the best
Gameplay: 8/10 - losses mostly to missing features in part 1 and the change in part 6
Atmosphere: 10/10 - once it sucks you in, you won't get out (at least for part 3 to 5)
Overall: 8/10
Part 1: 6/10
Part 2: not played
Part 3: 8/10
Part 4+5 (WOX): 10/10
Part 6: 8/10
Swords of Xeen: undecided, but see it as a bonus game made by fans