I haven't tried out the Ultima Series except for IX Ascension. I can't remember why i haven't finished it - i guess the world was just too empty for me (Gothic for example has a very lively world!) - and i played Ultima Online for over a year on a freeshard...man, the good old times
Might & Magic:
I & II: Haven't played them yet and i guess i'll never do, the graphics are just too bad, you can only save the game at the inn and there's no automap!
III: I got the Might & Magic Trilogy (III-V) @ Ebay so i can finally finish The Islands of Terra, it's really damn hard!
IV-V: Besides VI my most favourite games of the M&M series, you can play months with that game!
VI: How should i describe it? OMG I JUST LOVE IT! Okay, the graphics are bad, the (german) voice acting is horrible, but the world is really big and it's so fun and it's fantastic to discover the world!
Oh well, i think i just typed too much

VII: I bought the game when it was released but didn't play it for too long, because on most CDs there was no music pressed - and i think M&M is living from it's music. I was too lazy to ask 3DO for a replacement...well guess i'm a bit too late for that now, since 3DO doesn't exist any longer

I wish someone could arrange the Soundtrack for me (i've ripped the OST for VI - The Mandate of Heaven already, hopefully it will spread all over GFF) or else i'll have to buy a budget version of VII.
And Wizardy? Maybe i'll give it a change sooner or later
