I haven't had lag issues. But I agree with IGN and others. When you consider what went into this game, yes, it's a mess. The game has serious issues.
People should be fired for some of the decisions that were made for this game. Complete morons working behind the scenes.
It's almost as if they got a bunch of RPG illiterate old farts to sit around a table and take shots in the dark on what a wiz kid would like to see in a role-playing game.
The artists are truely incredible. But it all ends there.
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First of all, this is not the issue at hand. There are literally THOUSANDS of threads going "this is not an RPG!" everyday. Go whine there.
BUT, as much as I hate to admit it, I must agree to one thing: their secretive strategy of releasing as little as possible has SERIOUSLY pissed people off, and look what it gave: thousands of people whining about bugs.
And you know what the worse in all is? I have an unpatched game. Not even the day 1 patch. And besides the occasionnal crash or slight lag, I have literally NO problem
(and BTW, besides a FEW MMOs that got it right, this is the most true-to-RPG-gaming game made in the last few years. deal with it)