Classify these as positive or negative reviews: "Interesting concept but execution left a lot to be desired", "Would have loved it but the main character was completely 1D", "One of the best horror books I've read in years", "Would see it again"

"Interesting concept but execution left a lot to be desired": negative, "Would have loved it but the main character was completely 1D": negative, "One of the best horror books I've read in years": positive, "Would see it again": positive