Was GSLV Fatboy a failure?

GSLV Mk III also known as the fatboy was not a failure, it was a success. It can carry heavy communication satellites to Geosynchronous Transfer Orbit (GTO). You can read about the GSLV Mk III – A Comprehensive Overview of Heavy Lift Launch Vehicle in the given link.

Further readings:

1. Mars Orbiter Mission (MOM) – Payloads, Launch Vehicle, Achievements
2. Reusable Launch Vehicle – Technology Demonstrator (RLV – TD)