I thought I'd add my two cents here.

I struggled with Titan and could only dodge 90% of his attacks or so, which isn't enough for a healer. I found this very frustrating because I always took damage while being "out" of the plumes or whatever on my screen.

Then I used the "force-update" trick by casting a spell after I'd personally got out of the plumes after I read about it on these forums. Supposedly, this forces the server to acknowledge that you are out of the plumes. Lo and behold, I suddenly dodged all of the plumes -- even ones that I very narrowly dodged. Before, I had to dodge by a full 1 second to get credit.

This seems like a programming error. The server needs to force-update where players are before the plumes erupt. The fact that a player can "fix" this by casting a spell shows that the mechanic is working incorrectly.

This same simple careless error probably also explains other issues that people are having (e.g., landslides being fussy even on Story Titan at times).

Note that I think this issue seems to affect PS3 users more than PC users. My PC-using friends (as evidenced by typical youtube videos and such) face much less problematic latency issues. I mention this so that an PC users can understand that hardware interacts with the above phenomenon (albeit in a way that players can force-fix by position-updating).