Alright, now I might not get all this technical stuff(In fact, I'm pretty sure I don't) But from what I've noticed in games, there seem to be a lot of problems here and there when I play on unlagged.
Sometimes, I would shoot exactly at a dretch, see my md shot pass through him and hit the wall exactly behind the guy, not forgetting he's going in a straight line, and the shot would actually miss.
At other times, I would shoot, and know I was 15 feet away from my target, and yet I'd hit, and possibly kill my opponent. Now this is my personal biggest dislike of unlag and really, I have no idea how and why it happens. My guess would be that unlag might actually leave an information trail as to where hitboxes are and were, and that the server doesn't read the information I might send correctly.
Now, there are other problems that I personally dislike.
First off, unlag makes aiming so much more easier that anything lower then a goon mince rifle meat. And unless the goon actually camps behind corners waiting for that head shot, then he's in deep doodoo. This forces alien to camp corners ten folds, and even then, they are often taken down by a single shotgun shot. This makes humans overpowered over aliens if the human team is any half decent.
Secondly, the sudden rise of aimbots. Unlag favors aimbots since it makes it easier to use and easier to code. Without any ping issues, an aimbot will alway strike true, whereas if the aimbot had to shoot a 150 pinger, it would most certainly miss.
Thirdly, It makes human camping games hell. No goon can pounce for a kill with 3-4 aware campers without seeing his face splatered on a near wall. Games on servers with unlag(Especially on atcs) have either become a huge alien slaughter or a huge human campfest.
Franctly, after reading a few post here and there in this thread(Sorry kev, I skipped a few of yours, they were giving me a headacke) I noticed a lot of you stating they play on dretch*storm or other gigantic player servers that run unlag.
Now, let me state something, I got kicked from D*S twice and got banned for over 2 weeks because people said I aimbot.
I'm banned from over 5 other servers running unlag for the same reason.
I regularly get kicked from servers running unlag for this same reason.
I spend my days playing with actual good players that have prooven their worth both on lagged and unlagged servers, big people that everyone knows. Here I mean: bodyorgan, kattana, orc, black, most of zub/zilla/oldkillaz, iabz, and I could pass over a dozen others that almost everyone knows, people who have near 8/10 aim on lagged and 9/10+ on unlagged. Though I'd say I'm not the best, and in fact, far from it, I do beleive I still hold more skills then 3/4 of the community. I've learned through the hard way that unlag makes any semi competent human team a nightmare for aliens. If the human team as any sort of teamwork, aliens can easily be dispatched.
All in all, I beleive unlag to have brought more calamity then miracles. Simply because it is useless with pings under 80-90 and that if you can't get a server with lower then 200 ping, then maybe you should either consider buying a better connection or simply not playing online games of this genre, especially today with over 200 servers located around the globe. It brought about the release of aimbots, shitloads of problems and made humans more overpowered then they were(Yes, unlike all you morons who think humans underpowered, I believe them to be more powerful exept for nakedvsgoon) and make it easier for noob laggers, who shouldn't even be there, to hit.
Unlag is unneeded. Proof coming from the fact that the games that use it can be counted on the fingers of a single hand.
Just my 2 cents.