When makes were scored on a scale indicating percent better or worse than average, with 0 being average, Toyota and Honda took top place with an average score of +48, meaning on average 48% more reliable than average. All of their models were at least average or better.
MB came in dead last with an average score of -123 followed by Land Rover and Hummer with average scores of -97 and -70 each. None of these makes had any models with above average reliability. MB's models ranged from -200 to -35.
In the category of midsized SUV the MB M and R Class were both rated least reliable, and the Toyota Highlander and 4-Runner most reliable.
J.D. Powers reliability ratings show the same thing.