Obi-Wan: Sith Lords are our speciality
(was that a joke? He's talking as if this was some kind of restaurant)
(was that a joke? He's talking as if this was some kind of restaurant)
I think it's a self-deprecating joke. The Jedi have encountered three Sith Lords in the last 1000 years. The first one took on two Jedi at once and killed a master before a padawan brought him down by a fluke of good luck. The second fought three Jedi, including two masters, to a standstill before escaping. The third got elected head of the government and they never figured out he was a Sith, even after Darth Tyrannous told them.
Sort of like, "How did this happen? We're smarter than this." It's clear that the Jedi are beginning to realize they're idiots, so they make light of it as they rush towards their own destruction.