In principle, watch them all; they are good series with subtitles.
This is also good; everything is laid out clearly – it covers the birth of the franchise, the factions, the IRL aspects, and the community; I recommend watching it all if you're not too lazy (o5).
Here's another good reviewer; he's a cute guy.
http://www.youtube.com/watch?v=dzUiMW3sOkk
Just don't die from an overdose.
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