My understanding was the same as yours, and that's how my meetings work. The one I go to is listed at 5:30 pm, and they usually start the WI right around 5 pm. The leader is pretty good about beginning the actual meeting right at 5:30. Before that she is either helping out with weighing or getting new members registered. The meetings themselves last right around 1/2 hour, so we're out of there by 6 unless it's a "hot" topic with lots of input/questions (not often, frankly).
On the boring/unmotivational leader topic - good luck! It sounds like there are a lot of those out there. I have been to a number of different meetings and only found a few really good leaders, though I have several leader friends in different states who I know are good - I just don't live there!

Right now I live in a small town and while there are 3 meetings between our town and the next (20-30 min drive), they are all run by the same leader! So no choice for me, sigh.