Actually Mercedes Benz reliability has gone down the toilet since 1985 when they started to cut spending in production.
MB has suffered from bad subcontractors, electrical problems related to that, manufacturing problems (serious rust in 2 year old vehicles) etc. Toyota beats MB in reliability hands down. I still own two E-class MB anyway for some reason.
But I'm telling you - they eat money in maintenance. I've spent $7000 maintaining the two of them this year alone. Starting from regular service interval ending up to mechanical repairs and paintjob. I'm thinking of selling the other mb away, they're breaking my bank.