Mysterious Isle is an easy tier 4 that hasn't aged well. It was ok when it came out as t4 should be story driven but the story wasn't that good. As more t4 comes out this will sink lower and lower into the bog. But do check out 5-19 its the same with easy combat but the story picks up and makes it a better experience for the players! I would DM it again but only for people wanting the full experience with 5-19, I wouldn't DM this on its own.
[3 of 5 Stars!]