Yes, IIT Delhi MTech Machine Design students do get placed with decent roles and packages. In fact, after IIT Bombay, IIT Delhi is the most preferred IIT for students mailing to get enrolled in the MTech program. The 2 main reasons for this are listed below:
MTech Program offered by the Mechanical Department of IIT Delhi has a decent placement scenario with a placement percentage of around 70-80%. Design stream has the best placements in the entire department in terms of the average package as well as placement percentage. Mainly roles in R&D and a few managerial roles are offered.