This wins the "worst-of-the-best" award from me. The design has that classic Legoland feel (like 6080, 6073, 6086, etc) in terms of color scheme and construction, but it's got to be the WORST use of the CRAPP baseplate, and illogical uses of space I've seen in any enclosed castle set from Lego.
One of the first odd things I recall was wondering what was up with the 2nd floor of the keep. The hinged door on the back made it look like a prison, but there's a trap door inside (for... escaping?) and there's an unblocked doorway that leads out onto the battlements.
The interior space is also sort of odd. The majority of the raised space looks like it's used as some sort of garden rather than a proper courtyard, since there's a tall wall that sort of unnecessarily divides the 'entryway' from the 'garden'. Plus, the low wall on the outside makes it look more like a small stone wall for property delineation (even though, yes, being on the top of a raised hill makes it properly defensible). Anyway, it has the look of the princess's flower garden rather than a courtyard.
The other major chunk of the interior section is the ramp, which hardly looks conducive to anything other than an entryway. And the only other interior spaces left are the 2nd floor of the keep (which looks like a prison), the battlements, and a small area under the keep. So to me, there's no sense of genuine interior space that's usable.
The other odd part was that the height of the ramp-side battlements (where the single connection point is) is actually LOWER than the rest of the castle connections system. ... And there's just one connection point, so you can't wrap a bigger castle around it. The funny part is that the battlements around the "garden" are technically about the correct height for classic-castle style walls: 1 baseplate + 6 bricks rather than 1 baseplate (or 1 plate) + 6 bricks + 1 plate. But they don't actually connect to anything!
Otherwise, it's got some charm to it. I was never a fan of the black castles (since they look cartoonishly evil)-- in comparison the gray castles look a bit more "real", even though in this case the design is so bizarre. And for parts, this set has got some gems: the princess, body armor, visored helmets, horse barding, the black bird, foliage, and the large door elements (which at the time were a new element).
All in all, I can't say I really like it as a set, but there are a lot of elements to it that still make it a good addition to the castle lineup.