Nydus is very good late game. It is used for effective harassment, and a good way to put the money you banked up to good use. I watched the replay and the only thing that PiG really did was snipe the third, which was huge, but all his other nyduses were denied. I think having two networks at once greatly increases harass potential as eventually your opponent will not be able to keep up with the constant stream of nyduses and units.
If you really want to see the true potential of nydus watch the APL cast this coming saturday. There is a series in there which shows just how powerful nydus play can be especially from behind. That being said nydus is good, but drops are better generally. In lategame zvz you have to have units patrolling for nydus or you get pulled WAY out of position! Especially because you cant tell if its double-nydus or what.
Denying a third in zvz though is really strong, I think I was in a good position if I could keep my gas up by having more bases. Unfortunately I just ended up with no gas and died horribly. I'll be sure to check out those games PiG and yeah nydus is annoying. Although I still don't know how people are supposed to defend infestor drops late game, if you defend your trading money for energy which in the long run is a bad trade and if you attack he has infestors and spines and a massive defenders advantage.
Haha yeah well you just have to be under them, and added corruptos/muta patrols to catch the ovies. The 150 gas for an infestors is worth way more then killing a structure or two in lategame as gas is always the limiting factor so whilst infestor drops are great, u only need to lose a few infestors for your damage to not be as huge
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