It is something i have seen ...last year in my company 5 people got fired because of poor performance .. i was surprise to know 2 of then were IIT'ian .initialy i though IITian are very good how is that possible..then via HR other resouce we came to know they were from reserve class...so making in IIT does not make u job gurantee...end of they u have better than other person working with u ..