Probably the most prevalent misconception about IITs is that they create genius people. A look at the selection system for the IITs - the formidable JEE exam is good enough to justify that the students who step in IIT are already extra-ordinary academically. Its a simple statistical fact that the bunch of students who stand in top 5% of such a tough competition are ought to work wonders. Infact the way educational system of IITs (IIT Bombay to be particular, is no different than the teaching system in any standard JEE-coaching class).
So to say that IITs do play a role in creating genius just because these people are successful later in their career is false reasoning. Infact, a look at the profile of IITians who have graduated in recent years and the kind of work they are involved with suggest the quality of people comng out of IITs has been on a decline. Infact, to give an example even the presitigious IIT Bombay couldn't save itself from the adverse effects of the IT-boom and the catastrophe that followed. The blind craze of software, lacking proper insight, continues to be as fervent as in any other regional college.