I've typically had no issues following a patch, but I have a couple friends that do, one of which I know doesn't complain about... anything.. and I'll hear him gripe a little here and there, but nothing major. Also have to keep in mind, most people are complaining due to the amount of hits (especially in HC) enemies take sometimes, and I always remind them there's another form of lag beyond basic connection/compensation lag. Host Synchronization lag can be a pain in the ass since it doesn't manifest like typical connection jitters... a sync lag, and this is especially for HC players, will have you blasting someone's back from close to medium range and getting nothing but hitmarkers (no vest marks) and then they cap you in one shot on a turn around. What's actually happening is your sync to the host is off by up to a second, but the client continues allowing you to play until it either disconnects (rarely) or catches you up with what the server is seeing. So all those blasts you got were only on your console, what actually happened was you wound up coming up behind said guy, sync lagged and stopped for about a half second, he turned casually and shot you standing perfectly still... which probably puzzled him a bit lol then he moved on. The server doesn't count anything you did from the moment you synced out slightly, it accounts for the last action you took while synced to the host and caught you up. That happens a lot on pc online games and MMO's where it continues to allow you to see things and preform actions, then suddenly catches your sync up and something completely unexpected happens.
This happens to certain people a lot on my friend's list. The one game I was able to spectate my above mentioned friend and according to him, from his perspective, he ran up and knifed a dude in the back, then suddenly died and the guy was walking over his body. From the spectator cam, which is what the server sees, I watched him run up, stop for a moment, the guy turned, shot him, then moved on. He never knifed at all. I've had this happen to myself, but I know what it is when it does. I just glare over at my modem and move on lol with full connection lag, you see the laggy effects because your sync is actually still up to par with the server, but the connection (it may not be yours but someone else) is dramatically dropped.
Now this is not an excuse by any means, because I know more people that just blame their poor hand-eye skills and timing on something that really had nothing to do with their true frustrations, so... I mean, when I see a buddy of mine constantly complaining about lag or it was BS this or that happened, 9 times out of 10 it's because he isn't nearly as good as he might hope or believe... sometimes just looking at their K/D can give you a pretty good perspective as what you should expect.. by no means fully trust that the guy with the 1.0 is going to be a fairly average, if that, player (I've had plenty of 1.x's roll my ass).. but when that same guy is constantly complaining about this or that or whining and blaming things like lag... yeah, sometimes it is hard to tell a friend they just aren't good >.< I usually try to compensate for one or two of my buddies that die more often than kill, and despite their complaining and blaming we'll pull off a W for the chart... but yeah, there are times when the complaint is legitimate due to their sync dipping briefly... it's just difficult to tell if that's the cause or not since it only affects you and not the people around you... unless of course you're the host, in which case you're the reason everyone in the match is jittering or rubberbanding all around since the server is trying to sync you up, and we're all connected to you.. LOL I've won games for my team during massive rubberbanding before... wholllllleeee different playstyle required to pull that off with more than pure luck haha