Warlock of Firetop Mountain does a great job building atmosphere in the pen and paper tradition. While it's not the best writing I've come across it has the right vibe for a retro D&D adventure module. I found the combat to be initially unintuitive and ultimately infuriating. I also found the trial-and-error adventuring style frustrating. I think this is mostly a nostalgia generator, and it may be great at that, but for me it kept all the worst parts of D&D and the new stuff didn't click.