Do you not know of the
netcode bug that is plaguing matchmaking right now? It's not a
silly rumor and you should really stay informed before commenting on such things so as to not spread misinformation yourself. Ranked is affected far more than endless lobbies due to private lobbies being unable to be pinged and don't show up while matchmaking. Public endless lobbies are affected by the bug but since not as many people create them there are less lobbies being pinged and thus aren't as affected as the multitude of individual ranked lobbies are.
Maybe not. If you remember they did release a netcode patch a few days before Ultra released and then with Ultra probably came more netcode tweaks, one that presumably created the matchmaking problems that lead to laggy matches, true, but perhaps there were other netcode adjustments that simply haven't shown because of the massive problem caused by the bug. Like I said in my previous post, private endless lobbies have been fine, and actually felt like pre-steamworks transition netcode while being in a 5 man lobby. That's part of my frustration, is that these endless private lobbies give me hope that the netcode has considerably improved, but the complete garbage that is ranked mode, which is what I play 90% of the time I go online, has tempted me to give up on the game. 360 version is looking better and better as the days pass...