According to this article in the Globe, Aeroplan ranks third only behind Southwest airlines and Air Berlin for redemptions...
However, the author is fairly quick to point out the 'reward price' versus 'stated value'. Effectively, another form of information (e.g., in theory I can redeem in Canada for 25K miles but this rarely happens, its almost almost more like 35-50K for round trip)
http://www.theglobeandmail.com/life/...rticle1660694/
Happy reading