Episode one was good. The animation could've been better, but, meh, who cares? It's fucking Slayers, I don't care if it looks like 2006 instead of 2008 when the alternative is to look like the 90'ies. However, aside from being more than that both VA-wise and script-wise, I'd like to say one thing. SLOW THE FUCK DOWN, DAMNIT.
They crammed way too much into one single episode for things to get really good. Slow the fuck down, seriously. I could barely follow in some segments.