Does there exist a scale by which languages might be rated for their ability to let the user easily or concisely express concepts? I am not a professional linguist, but I do find that some languages, such a Hebrew, make it more difficult to express certain subjects than do other languages. Other languages, such as Russian, make it easy to unambiguously express or confer complex ideas, even concisely. I've heard that Swahili is an inherently simple language in which one cannot express many complex (not necessarily modern) concepts, such an example would rate low on this scale.
Any language is, ultimately, able to convey any idea that a speaker might wish to convey. Certain languages might find certain ideas easier to convey than others (for reasons ranging from 'having a grammatical structure that's convenient for that' to 'having a large and developed technical vocabulary for that field'), but you can say anything in any language, even if you have to resort to loanwords / on-the-spot coinings or convoluted sentence structures.
You might be able to rate languages on how easily they can express certain individual concepts (for example, a number of languages in the Amazon would rate very high on a scale of how easy it is to note where information was obtained from; Korean and Javanese (yes, with a v) would rate high on a scale of how easy it is to reference social hierarchy, etc); but it mostly evens out on average - few, if any, languages struggle more than others on the whole. (And really, most of the difficulty that comes with conveying complicated information is due to just not having the words, a problem that is -very- easily solvable!)