This was a really good first episode! It sets a lot of things up and (unlike some first episodes) it was interesting. However, I gave it an 8.8 for goofs/nitpicks (or trivia, as it's now called!) and the acting was as good as other episodes...
Yes, unfortunately, the acting was not very good! The actresses seemed like they were trying to adjust to their new roles, but it's okay because it would get better later one! =D
The plot was also interesting! I honestly thought that Piper's reporter boyfriend would have been on longer, but he was surprisingly evil! And, the way the sisters became (or not really because they already were) witches was believable!
All in all... everyone should see this first episode! (But I didn't see it until it came out on DVD, so go watch!!)