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I'm sure that people inclined to find fault can highlight any negatives (I had a brief crash/rollback and my low-level sorc pets dissapeared every now and then... I'm sure other new glitches were introduced as with any big patch) but the performance and responsiveness of abilities and weapons felt much improved. Instant really means instant now instead of "sort of instant."
The new lighting also has some subtle but noticeable improvements: everything looks brighter and the colors are more saturated. There was even one indoor fight I had in a room that had a mirror and the reflections of the effects on the mirror were really good,
It's a BIG dl... about 9 Gigs total. I was off work yesterday so I spent several hours playing on my level 15ish DC sorc alt. Other than the two things I mentioned above, the game play was rock solid.
Also...it could just be the more responsive abilities allowing for a quicker sequence of attacks but it also seemed to me that I was downing trash much faster than before. I'd be interested to know if others that have played at higher levels--especially VR--also notice this.