Most large companies don't let the noobs anywhere near the clients. They're pyramids, the longer you stay the more interesting work you get to do. This competes with the better the job you can get elsewhere, which causes gradual attrition in the ranks. It's all about who can stick it out the longest.
Ground zero is very, very dull work. Like photocopying while being charged out at hundreds of pounds an hour.
Remember, these are graduates, they're totally useless in the real world at the start.
On the other hand, I've had a fantastic breadth of experiece - technical, commercial, in great teams and on my own. I work with really interesting and significant clients across sectors, and have the pleasure of seeing my contributions making a real difference. I have done work here that has quite literally resulted in lives being saved.
Not dull at all.