I have the same problem too :( I don't live too far from the servers, but I'm getting 240ms or higher while in Arena/Cross-server Dungeon. I run around 80ms on average in Open World which isn't the best considering how close I am. After running PingPlotter this what I noticed.
ae-25-0.ear1.Dallas.Level3.net (1765ms on average, but most of time just has ERR)
After using Ping Plotter many times, I'm getting range from 91% to 100% packet loss from ae-25-0.ear1.Dallas.Level3.net. Once it hops to the next route (22.214.171.124) it drops right back down to an average of 50ms. I believe that anyone connecting to Level3 in Dallas is likely to have high ping. I'm a plat BM and its very hard to play when lag hits me like freight train in the middle of a match on occasions. Luckily, skill lag isnt a issue for me unless I'm trying to roll backwards during a trip in the middle of the opponents combo. I often times have to spam the F key (which is the skill that allows me to roll back) up to a second or so before it even appears for me to sometimes be able to escape.
NCsoft if it's a problem with Level3.net please sort it out.