Quakenet is close to 200000. Now if you look on netsplit.de which is much more reputable than XGoogle (A site funded by a porn website, and another site that has chosen to use a pornographic picture as their logo). Netsplit.de says 
http://irc.netsplit.de/networks/list1ua.var                  avg. u     max. u
Quakenet  148047   171617  
Undernet   120134   130727  
IRCnet       117942   128285  
EFnet         112322   126964 
Notice how the quakenet maximum is higher than anything the other 3 listed there have ever reached. In fact the reported average is even higher than the reported maximum for the other 3. As for GamesNet I don't even have a clue what you are talking about. GamesNet's maximum is reported as being less than 40000. How does that even come close to comparing to networks with more than 100000? So I fail to see your point...