If you disliked the acting and dialogue, you clearly misunderstood what was going on in the show. It's not meant to be a serious and heavyweight fantasy like LoTR for example, but a fun ride that you can sit, relax, and enjoy for 40 mins. For me it even felt a little bit like fantasy satire. At some points it was almost breaking the fourth wall even, like when they were talking about "the quest" they were on (as if it's a video game) and mocking the tropers they were getting themselves into.
So having said all this, acting and actor choices were spot-on, especially the Graydon actor - he did an amazing job with the role.
I really wish this gets past the audience thickness and score bombing and renews for volumes II and III.