DTU is a government institute under the NCT Delhi. The institute has a wide range of branches like Production, Mechanical, Biotech, Civil Engineering, Environmental Engineering, etc. These branches aren’t available in tier-2 colleges like NSIT and IIIT Delhi. The core branches have poor placement statistics which makes the NSIT and IIIT Delhi placements look better.
Most students don't set placements as their goals after BTech these days but prefer appearing for competitive exams like CAT, GRE, GMAT, UPSC Exams, SSC Exams, GATE, etc. That being said, Delhi is the supreme location that offers excellent opportunities for coaching and preparations for these exams apart from great placements and campus life.
Here are some official rankings of DTU
Overall, DTU is a great option considering its ranking, location and the opportunities available.