yeah, sinclair was wooden, hell the entire cast was pretty bleh in the beginning, but the grew into their parts pretty well.
if you like more trivia than you can shake a stick at, the lurker's guide to babylon 5 has a ton of it with lots of commentary from the creator of the show. the show even references lurkers at times (the people in 'down below').
http://www.midwinter.com/lurk/countries/master/eplist.html
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There is no shame in not knowing; the shame lies in not finding out