Personally my favs are Matriculated and Beyond.
The former more for it's technicalities than the actual plot (Which wasn't clearly resolved) and the character discussion (Which quickly lost focus.) Having watched a few episodes of the director's prior work, Aeon Flux, I did expect a certain degree of fucked-up-ness to the storyline (Figure it out for yourself is all I can say.) The intensity of the visual and audible experience (The robot sounds owned me!) always made up for it.
I liked Beyond's simplicity and the relevance of the storyline. There were many allusions to the contrast between the ordinary, routine monotony of daily life in Japan versus the free-spirited exploration every child enjoys. It reminds us that we were all once young purveyors of chaos, naturally attracted to "Render Anomalies" such as that haunted house.
I didn't completely understand the techno-gangland visual style implemented in the Detective Story. Was this meant as the Matrix interpreted through the PI's perception, another version of the Matrix, or simply nothing more than eye candy? I'm leaning towards the latter. It doesn't have much else.
World Record was rather nice in the way it deviated from The Matrix's original visual style into something more expressive than derivative.
I found 2nd Renaissance too cliched (Just like the climax of the director's other opus, Blue Submarine 6) although as a "historical documentary" it did have the largest scope. The war scenes were very engaging.
Kid's Story tied in with the movie in a pertinent but ultimately predictable manner.
Program had a unique samurai style (Complete with a Crouching-Tiger-esque jumping-on-roofs scene), but that was about it.
Final Flight was nothing more than a novelty CGI tie-in IMO.
If you need your Matrix fix then by all means go watch all of them, just don't expect to be consistently blown away like in the movies.
"Nothing livens up a robotic hymn of doom more than an amazing pair of jugs." - Brak