Just got back from this and I loved the new one, it's about as good as anyone could hope for considering the cult classic source material. The setup for the plot was strong and feels well thought out when the horror finally arises. I really liked the gore in this, way over the top in a good way and just plain brutal in some respects. Lack of CGI really helps, R rating, lack of "star" actors, lower budget is a plus.
Only a couple things bothered me, notably one spoiler aspect near the end that I won't reveal for others on here and I felt they could have used one aspect from the original that wasn't fully explored. These were minor issues though and didn't detract from the overall impact and really surprised me with the twist and turns all the way up until the end.
Being a lover of the originals, I find this to be a worthy entry in the series and would be good with a couple more sequels if they go that route. I absolutely hate remakes of "classics" and was very skeptical of this movie upon hearing the idea of a remake being conceived but they did the re-imagining the right way. (Homage to the source material isn't overt, subtle changes in dialog and minor plot twists without straying to far from the original intent of the old movies people love, etc.)
Cabin in the Woods is a movie I enjoyed as well, agree with most horror fans on here about that one.