Well, the brass doesn’t go as brassy as some other libraries, at least not within the legato or longs patches. They do however have separate Quivre patches for that.Doesn't BBCSO lack in dynamic range? Also how good is legato and stuff?
If 3DC likes Poledouris, Goldsmith and Morricone, I'd go with something like Cinematic Studio Strings, Brass and Woodwinds.
As for the rest of the library I actually think the opposite. The range from silent to loud seem much larger in BBCSO than in any other library I own.
It still doesn’t sound as “epic” as some alternatives but for the most part I really think that’s a matter of sound signature rather than dynamic range.