CBA has been ranked as the top-scoring employer and NAB and Macquarie as the lowest-scoring among the major banks for reviewers posting on workplace rankings site Glassdoor.Some 88 per cent of CBA employees at the site would recommend the bank to a friend as a place to work, and 93 per cent approve of CEO Ian Narev.Glassdoor (glassdoor.com) has emerged in the past two years as the most widely referenced global site for rating employers - a sort of Amazon for workplaces. It allows members to nominate and score their employer, as well as comparing data on pay and conditions. Its revenue comes mostly from "premium employer accounts" which let employers advertise to prospective employees.The site says reviews go through a moderation process and that it works to verify that reviews come from genuine employees.Glassdoor has recorded 785 reviews for the five largest Australian banks, ranging from 72 for Westpac to 273 for Macquarie Group.The numbers collected by Glassdoor do not have the validity of professional surveys, and the figures may be biased in one direction or another. In particular, Glassdoor cannot prevent employers from soliciting positive reviews from their employees.However, the Glassdoor reviews represent some of the best available information on how bank staff see their employers. Rival workplace review site JobAdvisor, reports broadly similar results, but with generally fewer reviews.The CBA's overall Glassdoor score - 3.8 out of 5 - matches that of firms such as eBay, Disney and Starbucks, all named in Glassdoor's 50 Best Places to Work for 2014. And Narev's score puts him among the elite of global CEOs for employee feedback.Comments on the site commend CBA's people and its culture, particularly in developing its staff, as well as its advocacy of work-life balance. Some warn that the organisation can still be "frustratingly bureaucratic", and some say the working experience depends on getting one of CBA's apparently plentiful good managers.At the other end of the scale, just 54 per cent of current and former Macquarie and NAB staff would recommend those banks to a friend as places to work.The site paints a picture of Macquarie Bank as having smart, talented staff and well-paid, interesting work - but a highly politicised working environment. Macquarie is "undergoing a difficult culture shift from a distributed, empowering one to centralised and bureaucratic', claimed one reviewer.Long hours at Macquarie not surprisingly attract criticism. "Forget about having a family life", commented one reviewer. "Everyone here is in denial about work-life balance," wrote another.The NAB is praised for flexible working conditions and great people but slated for red tape and reluctance to improve processes. Reviews frequently ask management to cease the "seemingly endless restructuring". And the company's overall score has fallen sharply since early 2014.CBA and Westpac stand well above their rivals for "culture and values". Westpac outshines all its peers in its "work-life balance" score, at 4.1 out of 5, with one 2013 review noting that "the maternity and working arrangements are very generous if you're a younger woman starting a