Yeah.. n number of times...
Also I found in google another way to install from disc. Goto Backup and Restore from Steam menu, Select Restore from a backup, there select your dvd drive as source , Steam will detect the game in the dvd. By this way you can install the game from dvd. but still that didnot work for CS:GO. Anyway.. if I got any response in the ticket,which I raised in steam support i will inform.
And about the flipkart reviews.. majority are fake. They started the review thouhgh the game is not released. In some review you can check that also. The game become available yesterday at 10:50 p.m our time. But before 10 o clock I checked there are already many reviews stating excellent game,wonderfull graphics, awsome gameplay.. crap crap.
