It's difficult to remove personal preference when presenting a sound argument. Many old-school gamers argue superiority over all in their pixelated classics, claiming that the gameplay, graphics, and sounds are much better in a lower-tech environment. Gameplay and graphics are an argument for another time, but the music debate has valid points on both sides. Anyone can appreciate the time and effort expended on fully orchestrated scores and context-sensitive musical cues. But that's not to say that the bloops and bleeps of an 8-bit soundtrack aren't without their own charms.
Whether you appreciate the soundtrack of Mega Man 9 as a throwback to the gaming tunes of yesteryear or as its own entity, the music fits the game perfectly. The repetitive tunes have you humming along by the second loop, and at random points later in your day. They even went so far as to have certain in-game sounds remove correlated layers of music, as the tight real-estate of the NES's sound processor used the same channels to create sounds as it did music. It's a nice touch that really recreates the atmosphere of an NES. Chiptunes artists often describe the sound of 8-bit consoles as "warm," and I'd be hard-pressed to disagree.
