The odd thing about this set, good or bad, seems to me to be the *diversity* of the Orcs. The Moria/Uruk-hai divide has been noted already, but even beyond that the Uruk-hai are sub-divided between a fully-uniformed Uruk and a freshly-born, loincloth-clad, Uruk. The reason this strikes me as odd is because, although it is not a traditional army-builder set as such (heavy on the minifigs with some tacked-on build in the $12-$20 range), this does seem like the sort of set, at least on the minifig front, intended to induce people to buy multiple copies, and I think that that would have been better telescoped by having solely Uruk-hai in the set--especially if they were going to leave off including Saruman!
That said, the inclusion of the Moria Orcs, though not especially true to the Books, *does* jive with my memories of the movie. In that narrative, Saruman's timespan of modifying orkish genetics from your garden-variety Ork (of which the Moria Orcs are typical) to sun-resistant Uruk-hai seems to take place in the span of the time Gandalf is imprisoned in Orthanc--and I believe we *do* see some of these garden variety Orcs in the process, though they are shunted offscreen once Saruman has sufficient Uruk-hai to do his bidding.
As play-sets go, this actually strikes me as one of the better ones out there. The multi-level structure is fun and the glowing fire makes the whole raised structure evocative of an island--perhaps in an underground lake of lava (as unrealistic as that might be). And more Orcs are always nice.