I enjoy it still. Rumpelstiltskin is still my favorite character. His eccentricities when he is playing the Enchanted Forest version of his character is great. However, I do think some of the story lines could have been written better. I wasn't that crazy about the Underworld scenes in Season 5. Now, they're branching out to the Land of Untold Stories, as the last episode of season included Jekyll and Hyde.
I don't think the acting is as bad as you're describing it, except for Henry. I don't think that kid is good at all. They probably used him because he was a cute kid and would gave some charm to the show, but as he gets older, all of that has faded. There are a few others who aren't that good as well but Jennifer Morrison, Lana Parrilla, and Ginnifer Goodwin are all great actresses.