Madness allows for some fun RP. I must say that the first two parts just seem random.
"Love Nest" has the makings of a nature documentary all over it. I'm tempted to run it as such. In part two, one would hope that there are Enclave members in the party, because a madness-inflicted treant encounter is a lot more interesting than some hill giants. I do like the chance for some political plotting with the Drow.

The tree is the meat of the adventure. Chances of falling, various monsters, and a ghost with an oath. The map of the tree is huge, allowing for plenty of exploration (and for a session to run long). It is odd that no matter what the adventurers do at the end, it is considered a success.

Overall, it is a decent adventure.