How many seasons did it run, and about how many shows were in each season?
There were 3 seasons. The first season contained 13 episodes and the second season had 52. The third season was entitled "The Goliath Chronicles" and also ran for 13 episodes. However, barely anyone from the original team worked on it, which resulted in shoddy animation and even shoddier story-telling.
The DVD artwork actually looks quite nice. I'm also glad it's been confirmed that there'll be commentary for the first five episodes (I was afraid it was just the first), since they comprise the opening "movie."
The ad again brings up why the DVD is being released in the first place- a really strong, loyal fanbase. Also, Gargoyles fans are more organized (witness the annual convention), whereas I haven't seen any centralized Ducktales community (correct me if I'm wrong). I think that to see our other beloved cartoons on DVD, we really have to let Disney know that we're willing and able to buy them.
Also interesting that they mentioned the numerous Star Trek people who have done VO on Gargoyles. I'm not sure if it was ever explained, but I sorta just assumed that they just referenced one another (although I don't believe Voyager was on when Kate Mulgrew did her voice-over work on Gargoyles). I think Patrick Stewart was one of the only TNG cast members who didn't provide a voice (apparently he was too expensive), which is a shame because I think he would have made a perfect MacBeth (of course, John-Rhys Davis does a mean MacBeth, too). The creator alludes to one or two other characters they were considering for him, but for the life of me I can't figure them out.
I suggest going to the Ask Greg site and searching for "Star Trek" for more info on how the cast was chosen: