I played the first Might and Magic's on my Commodore 64. I think it was 1-3. Then I missed 4-5, but I started again with 6, didn't like 7, enjoyed 8 a great deal and really, really tried liking 9 but failed miserably.
I think it's a respectable series. Lots of exploring, lots of quest, not so much dialogue but often good stories (except the earliest parts). Combat and character building has changed a lot between the different games, but they've mostly been enjoyable.