I am sorry, but defending desynch is absolutely the blind fanboy territory in my book. The blindest territory, to be more precise.
Diablo 3's netcode is superior.
Even Marvel Heroes's netcode is superior. It is snappy as fuck, allows me to dodge stuff at very last moments, servers do not crap out of me, etc.
Meanwhile, on PoE land, their code is "so complicated" you just gotta have constant desynch? Nope. Just nope. Just nope.
1. Tons of times, me and my buddy had multiple seconds of lag/rollbacks AT THE SAME TIME, which were confirmed by both of us through Skype (so we experienced it at the same time). That is SERVERS CRAPPING OUT, nothing else. And we were not even pushing them via COTC discharges or something crazy like that, nope.
2. There are alternatives. More servers, less distance, improved server stability is one thing. Localizing some combat code while verifying the loot and the inputs is another - this can be combined with some form of p2p to ensure that both players stay in the same realm. Other games do this.
Look, there were online games before PoE and there will be. It represents a negative spike in terms of netcode. That is fact. I understand the love surrounding GGG, but it is their mess now, and they refuse to budge any way other than "Slowly, maybe, just maybe, getting less and less desynch but not really".
I mean... if there is a game where certain builds are just no-nos thanks to desynch, then that is on GGG. Not on the players, not on the net, not on the genre. DO not make fucking Cyclone if you are not able to deliver it. Do not make leap slam. Forget Lightning Warp. Ignore flicker stricke. Remove them all, but do not pretend they are supposed to work when you warp folks back to previous packs regularly in order to kill them.
3...2...1....someone will reply to this, saying "I run cyclone, and I see no problems, wut". Well, yeah.
Edit: Gaming Truth, I meant no disrespect here, even with the blind fanboy thing, I consider myself almost one to PoE as well at this point. But they are not invincible to criticism on that part, imho.