Taggers are going to put stuff like details and a movie poster in the files... mostly helpful and/or informative AFTER you've found them in a list.
However, for
organization, I'm thinking you might be asking a different question. If I'm not mistaken, the "3" may have still supported the iTunes "show" tag... or was that the "2" (and definitely the "1")? The "show" tag offered a very nice way to group serialized movies by sticking a main name in that "show" field. For example, instead of having a list of now what- 10- Star Wars movies as 10 individual movies in a list, put "Star Wars" in the "show" tag and the movie list would just show one entry- Star Wars- into which you could click to then display the 10 individual movies. about 11 "Star Trek", about 2X "James Bond", Harry Potter, etc. For kid movies that you might not watch much, consider a show tag like "kids" or "animations" and a long movie list can get much shorter with the bonus of all the kids movies being in a single folder for them. I did the same with all of the "Super Hero" movies- using that tag to lump all the Marvel and DC movies into a single folder. End result, a big movie collection list becomes relatively small and well organized. The (IMO not too dear) UI cost is one click to click down a level into a serial movie list to then make a movie collection.
Of course, with the "3" or "4" Apple decided to "improve" on the "show" tag feature by eliminating it.

Perhaps they want to sell some virtual dongles to make it work like that again at some point?
But I THINK I remember the "show" tag still working with the "3". And it's easy enough to try and see for yourself with your own serialized movies. If you are using Meta-Z or Subler, you can enter something for "show" and then just see if Apple organizes it that way on your "3". Putting info in the show tag won't do any harm if the "3" doesn't support it.
FYI: using "show"
related tags allowed you to put movies in order without having to lean on something in the movie title to display part 1 before part 2 before part 3. In other words, using "Episode ID" and/or "Episode" tags in iTunes would put films in their sequential order regardless of movie name (in short: it overrode presenting the movies in alphanumeric order). I THINK I remember that still working with the "3" too, and it's also easy enough to try. And yes, then Apple decided to "improve" on that too.
If the above doesn't work with the "3" (perhaps I'm remembering the "2" and/or "1" capabilities by mistake), organization comes down to naming movies differently than their actual names (working in a way to put parts in part order: instead of "Star Wars: A New Hope" it's "Star Wars 04: A New Hope" and similar).
Even today, I still tag new additions with "show" entries, etc in hopes that maybe Apple will get around to resurrecting a "just works" (really well) feature to bring this simple, elegant functionality back to

TV.
Also the "TV Show" option for "video type" DOES still support tags like "Show", "Episode ID", 'Season" and "Episode" so one could opt to maybe split the display of their movie collection so that non-serial movies show in the "movie" menu and serialized ones are grouped together in the "tv show" menu. Personally, I see that as kind of kludgy and very unintuitive but it would give you a way to organize a big movie collection toward the elegance that one USED to be able to do it in a single category "movies" menu until Apple opted to make their "improvements."
I do suggest tagging commercial movies as "movie" instead of the seemingly default option "home movie", reserving the latter as a place to maybe store your actual home movies. For anyone that can care about their remarkably cinematic films of baby's first burp, etc, it IS pretty nice to be able to jump into a menu on

TV and get right to the clip you want to watch. Conceptually, it's supposed to be like that: commercial movies in "movies", commercial TV show in "TV Shows" and amateur home movies in "home movies." Even tagging that way may split out the commercial from the amateur, the tv shows from the movies, etc to help you be slightly MORE organized in the display of them all.
For
sorting, there are just a few options in some categories. Movies listed in movies will let you sort by a few options like "all" and "unwatched." A corporation chooses the sort options for us because obviously, corporations know best. But, there are SOME sorting options, so those may be helpful based on the kinds of sorting you want to do (and may influence where you decide to store your movies).
Lastly, if you try to work within the system and still feel too constrained, consider selling the "3" and buying a "4" or "5" and trying alternatives like Plex (app) and similar, which may better fit some wants in this direction than the Apple-decided defaults & constraints.
I hope this is helpful.