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We've updated our reliability stats for the M-Class to include owner experiences through June 30, 2016. Repair frequencies, in terms of repair trips per 100 cars per year (lower is better):

2014 M-Class: 10, low, small sample size
2013 M-Class: 47, moderate
2012 M-Class: 70, high, small sample size

We'll have further updates in November and next February. The more owners participate, the more comprehensive and precise these will be.

For the repairs behind these stats, reliability information on other models, and to sign up to help improve this information:

Mercedes-Benz M-Class reliability ratings and comparisons