"A rose by any other name would smell as sweet." - William Shakespeare, Romeo and Juliet
If we applied Shakespeare's logic to today's digital age, then it would also mean that watching mis-tagged or untagged videos on your Apple device (be it a Mac, iPhone, iPod or Apple TV) would be just as enjoyable. Okay, you got me, they'd probably be just as good. But this doesn't mean you're excused from tagging your videos appropriately.
First, a bit of background. The vast majority of videos purchased from the iTunes store, as well as "digital copy" (iPod/iPhone pre-formatted videos that are sometimes included on DVDs and Blu-Ray discs), will come pre-tagged. So, the situation for those in this camp (myself included) is peachy, especially when using an Apple TV. Your videos show up on the screen screen with proper titles, season and episode numbers, actors, and descriptions. Just the way Steve likes 'em.
But what if you already own the DVD and want a version for your iTunes library? For those of you with the time and patience to rip an MPEG-4 version (and believe me, this takes some patience, especially if you use H.264 encoding) of your favorite videos, a HandBrake-MetaX martini make tagging your videos a bit more of a pleasurable experience - as if it wasn't fun enough already.