Having read some more, I see I was mistaken. The four maps constitute a single adventure (although each part could easily be separated from the others).
It seems to be a pretty good, albeit standard, adventure for dealing with Drow and other underdark badguys.
It is definitely for the promotion of the miniatures game, but manages to be a pretty good RPG adventure as well (well, I think it would be, haven't run it yet). Yes, all the monsters used have a corresponding D&DM figure, but most seem to have their own RPG stats separate from the ones on the D&DM cards. I very much appreciated that. So it basically uses monsters fleshed out in whatever way the designer wants, and just suggests a mini that may represent it.
I think it looks good if you are interested in fairly short, straightforward adventures that don't require drawing out the tactical situation.