The ADAC (Allgemeiner Deutscher Automobil-Club) has done a survey of public bike rental schemes in all major European cities. London achieved 'sufficient' in most categories, while Lyon's Vélo'v was the clear winner.
The schemes are scored in various categories:
i) accessibility
ii) information
iii) handling
iv) bicycles
and weighted to give an overall rating for each city.
Interestingly, Belgium, Germany and France all generally performed best, while the Netherlands performed worst! Perhaps the metrics were geared towards 'getting around the place', rather than 'getting to and from railway stations'; I think about 1 in 3 passengers in the Netherlands travels by bike to a railway station.
Original webpage for menschen die Deutsch sprechen können is here:
http://www.adac.de/infotestrat/tests/urlaub-reise/city-bikes/default.aspx
and the methodology is detailed here:
http://www.adac.de/infotestrat/tests/urlaub-reise/city-bikes/default.aspx?tabid=tab4