OP, yes. we've all noticed it. You're brand new, it didn't just show up when you started. ;)
There is a DEV post around here somewhere from about a year ago now about the issues of AOEs and moving out of the way. They explained the slight delay all MMOs have and that it's been addressed.
You'll also find that in instanced fights and areas, this "lag" is actually a lot less and you can dodge things much easier.
