OoT is the hallmark game of the series. It's the game EVERYONE knows. It is easily one of the top 10 most well known and popular titles of all time. No debate, whatever you personal preference is. MM never reached that stature. It is a fantastic game, OoT is my favorite but if someone claimed MM was superior I wouldn't argue. It is one of the best games I have ever played, but again it didn't have the same stature of OoT. They may remake it yet, but I doubt it. I am not sure it would provide a huge financial boon for them, they may just not see it as being worthwhile. It's a shame MM isn't as well loved outside Zelda fan circles.