Hands down, this is my favorite all-time series and Pharaoh is my favorite adventure. The Hickmans show us the brilliance as they transform adventures from the dungeon crawls of old to inspired narratives (and would later perfect this with Ravenloft).
Each of these adventures is filled with imaginative encounters, cool traps and puzzles, great situations, and fun surprises. These are a lot of fun both to DM and to play. They capture an Egyptian and Arabian Nights feel, but also add a unique magical twist as the series progresses. Some of the later locales are amazing, such as a sea of glass in the middle of the desert. I've run these countless times and believe they should be on everyone's gaming shelf.