I loved the vanilla one with the Dwarf and Tauren, the Burning Crusade one with the Blood Elf, Cataclysm with the amazing feel to it. However, I'll have to go with Wrath of the Lich King, that was just such an amazing cinematic, you could really feel the power of the Lich King.
I think Vanilla was the best. All the cinematics did set a good scene on to what was going on at the time and in the near future but Vanilla did it the best/ It was mostly just pvp but at the time is was post WC3. BC was alright since it involves some pvp and against Illidan. I felt WOTLK was the worst because it made you completely forget about the Horde and the Alliance, just that the Lich King is back. I'm not saying it was bad but not as well done as making it feel like how the game actually is. Cata isn't that bad. It's a lot like the LK one but it does at least set the scope that he's bringing the fight to us instead of just some menacing guy being there ready to wreck havoc.
If curiosity killed the cat, why can't speculation kill you?
I love each of them, though Cataclysm one is just epic.
"Pain... Agony..."
Classic. Nostalgia, and, a nice introduction to well, everything
TBC is best imo, some shots of the new villain and action from the new races! Cata cinematic really missed that
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WotLK, no doubt the most epic of all WoW's cutscenes.