Oh really? Sometimes I wonder if people don't even try anymore.
Please do Google searches for the following:
"swtor lag issues"
"wow lag issues"
"aion lag issues"
"lineage lag issues"
"lineage 2 lag issues"
"warhammer online lag issues"
"rift lag issues"
"eve online lag issues"
"everquest lag issues"
"everquest 2 lag issues"
"age of conan lag issues"
"city of heroes lag issues"
Lag sucks, and it's never a simple problem to fix. And simply no MMO is immune to it.