JNU placements for MCA are good. Some of the major recruiters for MCA are Google, Microsoft, Oracle, Adobe, etc. Students usually receive an average CTC of around INR 4-5 LPA. While the highest CTC goes up to INR 9-11 LPA. 

But JNU is a research-oriented university. If you want excellent placement in the technical field, it will be better to join the top IIT or NIT. You will get better technological exposure at these institutes. 

Placement for MCA at JNU is pretty good if you compare it to the tier 2 colleges. However, if you have the option to pursue MCA from reputed NITs (Trichy/Warangle/Allahabad), Pune University, DU, or IIT-R are then go for it. 

JNU offers more of a research-oriented degree, whereas at technical college you will get better exposure. You will also get the opportunity to sit for big MNCs like Amazon, Google, MS, etc.