It's all about perception.  The only thing that differentiates the firms among each other is market share.  Whether the firm is "good" or not depends who you work with when you join.  There are good consultants and bad consultants in every firm.  You can join EY or PwC and end up with a crappy manager/partner and you still won't learn much.  Or you can join a small firm and work for a good mentor-type partner and learn fast. 

I wouldn't be concerned about the firm's so-called reputation among your friends and peers.  They aren't hiring you.  Anyone who tells you your experience in DKC is not are valuable as your experience in EY or PwC or KPMG is quite retarded IMO.  All this "I'm better than you perception" is just syok sendiri.  When you apply for job in future, employers don't say "EY / PwC experience perferred", they say "Experience in Big 4 accounting firm will be an advantage".