I used to love MM (still do actually) but it feels clunky at times. Plus I always feel like it's sending every move I make to the big corporation that probably doesn't exist. I dunno, everything seems so sluggish to me.
It does look the best imo, though. Perfect balance of functionality and aesthetics, no extra gimmicks besides maybe the music store that needs 3gigs of ram for some reason or another. I do like how every song file you click on is just added at the end of your current playlist. They were the first to do this. With iTunes you have to add it to a huge library of files that contains every song you've ever played.
Another positive is that it will work with just about any burner/reader out there. My friend couldn't get Nero or WMP to work reliably with his setup but I told him about MM and after using it he quickly bought the full license. It was also able to identify & rip songs from this wacky multimedia CD-ROM that wouldn't show up in any of the other popular rippers.
If Winamp's speed and tweakability combined with MM's interface it would easily be my favorite player.