MMX made me reinstall MM7. No, I've actually never uninstalled it, but I simply forgot to continue right at half way. Heck, it's making me want to install Wizardry 8.
Now there is one thing that MMX do suck compared to good old MM6 and 7: exploration. MMX is full of things to explore in every rook and cranny, and the gameplay length is very decent (I think I put in 30 to 40 hours to reach the end game), but let's be frank, the world is smaller than the old games and there are too many backtracking. A lot of places - especially the cities - look big and mysterious, but most are in fact just corridors cleverly decorated to look epic and full of depth. There are so many dead ends and background decorations around that make me feel disappointed that there aren't more content into it. The world size leaves more to desire as well, it feels big at first, but after clearing out the mobs (especially those tough roadblockers), you'll find the world is really small for travelling.
Now combine an empty world with lots of running back and forth for trainers, and the annoying party/city barkings, it makes me feel the gameworld less attractive to replay. Everything just seem so small and worse, predictable for me. For comparison the memories of MM6 makes me think it's fondly epic sized. From the freezing north to the scary as hell Dragonsands in the south, the world truly gave me the feeling that I can never fully explore it. Yet with MMX, it simply doesn't have such feeling.
But I do see there are lots of potential in the game. It seems to be very new content friendly, and if they can make an expansion set to explore a bigger outdoor world it'll be fantastic.