Quick book is a facility in the irctc site by which tickets can be booked if you know the train number.
For Tatkal booking, Quickbook facility has been blocked from 8 AM to 9AM, forcing online users to go through the lengthy process of searching through the list of all the trains.
This ensures that a very small percentage of the people are able to book their tickets online, and the travel agents, who block the manual reservation counters beforehand on any give date, are having a field day.
As for the normal tickets, one always finds the status to be waitlisted, even if only a few days has passed from the date of start of reservation.
This corruption in IRCTC regarding the booking of tickets needs to be stopped immediately.