I watched a subbed version, dunno which one, kind of annoyed about how all subs are like Lina-san, Zelgadis-san now. I can hear it fine, I don't need it to be in the text too.
Anyway, since it's only the first episode I can't really comment too much, the animation still looks good, Gourry's voice sounds weird to me. I know that a lot of the episode is just character re-introductions and setup, I mean hell they need all of the young kids to understand who these characters are since Slayers is such an old series now. The episode didn't really do much for me, turtle tank was definitely the best part of it. The gags were consistent with the old shows.
The show definitely has a lot of potential, and hopefully it can bring a rebirth in the franchise.