I'm one of the rare few not crashing in the usual places (Minas Tirith, especially) and my computer is very overpowered for the game (3.4 Ghz i7, Nvidia 4 GB card, 32 GB RAM and all SSD drives). I've recently come to the Moors to gather some comms for cosmetics, and I've experienced stop-motion lag, skill locks and massive skill delays. I can't imagine how horrible it is when you're trying to PvP, but it's bad enough out there that PvE is challenging.
Favorite Dev Quote from 2009: Graal: The lack of an instant threat catch up skill is one of the differences in tanking between Wardens and Guardians, just like Wardens dont have a easily used forced taunt. It is unlikely, but not impossible that this will change. Bottom line...Dont die.