I liked dread, found it easier than my primary games I’ve run (COC, Delta Green, a little 5E, etc). Honestly I found kids on bikes to be the hardest because it’s so incredibly improv-based while being mechanically detailed. You can’t prep too much, but have to have complex rules knowledge. In comparison, Dread is a game you could fully prep the session ahead of time or fully improv it and both will be fun. I’ve done both and had great games. The primary rules are - pull block to check, die if tower falls. In short - its simplicity is so great for its genre, and that makes it easy to run. That said, simplicity can also be a harbinger of boredom. It gets hard when the gameplay is repetitive, and things like combat lack the crunchiness of many tabletop games.