Sith, but it's a close one
Brentaal IV (atavistic feelings towards certain Star Wars comics)
Corellia
Korriban (without dumb Acolytes running willy-nilly trying to master the wrath of the dead Sith Lords as KotOR 1 and TOR set them: I mean the real ****, a damn graveyard world perilous as Hell itself.
Dxun (the Hell on the Galaxy created by simply interring a long-dead Sith Lord there)
Single-bladed sabres, exclusively. My days of Darth Maul fanboyism were gone 12 years ago.
Red blades are awesome, but blue, green and purple come close.
Three styles are the most enticing to me: Juyo/Vaapad, Makashi and Ataru.
Dug, Rodian, Gungan (foam, all ye haters).
Capital ship.
Yoda. He produces one bunch of awesome Jedi, who in turn produced a third generation of awesome Jedi, who in turn made... you get the picture xD
Hard decision. I think Kun would rock, if I was to be his choice of apprentice to show true power to. But most Sith Masters only produce pawns and proxies, not true Sith Apprentices. So I'd be more pressed to pick a Sith Lord from the early Rule of Two (Darth Bane, Zannah, Cognus...) as they are more likely to truly expose an apprentice to the full power of the Dark Side by their necessity of training effective replacements.
Darth Whatsisface xD Jokes. No telling, though I've had three Darth names that would be awesome. Darth Viperias (treacherous **** assassin), Darth Malefycar (from the latin for 'Warlock/Witch'), a kick-*** Sith Sorcerer, or Darth Primus (from the latin word meaning 'first'), not necessarily associated with a preformed character concept.
RotS, easily.
May be Episode I. But I don't dislike it at all.
A Sith Lord, who thought himself the Sith'ari.
Episode III had some remarkable pieces, such as the subtle tune that plays when Palpatine tells Anakin the legend of Plagueis. Also the Obi-Wan vs Anakin song rocked, and General Grievous' track was also awesome. Duel of Fates and the song that plays in the invasion of Naboo from Ep. I were also cornerstones to SW soundtrack. In the OT, I'd go with Ep V, with all the incarnations of the Imperial March, and the tune for the Sith Lords, and VI, with the song that plays when Luke overcomes Vader.
No.
The name. To expand on an awesome universe. It uses other people's creativities and contributions to construct the universe, and while it produces more than its share of absurds, it has produced some golden jewels as well.
There are plenty. The first stems from a complete disregard for other people's novelty, creativity and work, when authors publish something else that contradicts previous 'canon'. Discontinuity errors are inserted, sometimes willingly, at others out of sheer ignorance of what currently exists in regards to a particular topic, and I absolutely dread them, because they lead to absurd retcons which murder the previous classics.
The second, is lore butchery. The first example of this came with the unexplained survival of movie characters seen to die. Namely, Boba Fett and Darth Maul. Palpatine's return was slightly absurd at first, but considering some of the butcheries of the powers of the Sith that followed, I have a tendency to forgive that one. Another example are the way overblown and exaggerated powers of some Sith Lords in the EU. Naga Sadow being able to destroy a star without consequence to himself may be forgiven, because his story is told not as a factual thing in Tales of the Jedi, but rather as a legend, an allegory, which may have been coloured by time. But then, comes KotOR II, with Sith eating worlds and surviving being chopped up by a lightsabre with only their will to remain standing.
The third is lore hijacking. Some EU sources have the tendency of wanting to set the origins for absolutely everything. The most prominent case for this is KotOR 1, which forced the origins of an endless number of features (lightsabers, blasters and all Jedi rules to name a few), for the sake of spitting out a setting that looks too much like the PT/OT for it to be believably set 4000 years before that time.
It is an awesome fantasy world, which has a richly developped story, creating a long continuity of the long fight between two factions, morally opposed, showing the stark contrast between the two, and all their flaws as well. A parallel to the human mind and morality, but I'm rambling on to things I don't fully understand. It's also an awesome entertainment, with laser guns and swords and cranky mages working absurd magics with some manner of little-understood power xD