I don't necessarily think this is a bad episode however it is kind of all over the place and explains very little.
Perhaps they expected viewers to have seen the trailer and know the base story however even i saw the trailer and still wondered what the heck was going on lol
Obviously i get the gist of what the story is about, it just seems like it wasn't delivered in a favorable fashion and left more questions than answers.
Maybe that was the intention but by the end of this episode i wondered if it was worth it to continue on, i'll watch a few more just to see but i can't say this is an awesome start.
Only time will tell...
At the very least the actors did a great job, kudos.