I’ve mained LBM in mostly CN, with a bit of participation in JP and TW, and the most demanding factor for PvE is low ping for Draw LB, and RB [Hack/Sunder]. Yes, you can do a good amount of damage in PvE with high ping, but the cap is pretty much at 200ms. I was never able to clear Tower of Mushin Floor 8 Phase 3 with 200ms despite having nearly maxed stats in CN pre-Lv.50 patch.
For PvP, I would say the cap is also 200ms, but LBMs are mainly aerial combos and proper use the C skill.
While a simple class, your DPS, like many other classes, is severely severed with high ping, worse when compared to high ping tolerable classes like FM, Summoner and even BM.
Assassin, this is my main class and im playing it with constant 40-70 ping. The most enjoyable time is when you can spam RB + F as many as possible without getting any single delay on that. But i believe more higher than 100 ping can make the player thinks this class sucks to Buy Blade And Soul Gold. Since the main DPS generator of Assassin is RB and F and it requires low ping cauz’ we’re talking about the speed of the attack.
PVP : Well, no much talking in this one. Once Assassin got caught, most probably it died. So, the higher ping player got, the chance of getting caught is bigger. ;_; . With 40-70 ping, i can sit on 1600 to 1700 on arena. And also for the throw bomb + web combo, i almost sure that it cant be done with high ping. I mean even if you got sleight of hand, but the game still needs a delay for it, im sure it will fail.
PvE : True enough Assassin can still be played with high ping ex : about 120+, you can still do dmg or whatev such things needed to kill sth, but for dodging, its unbearable. One day i got about 100 higher ping because of ISP problem, and that time i was doing Yeti. usually i can dodge the ice slam up to 7 slams, but that time with just 3 slams i got freezed. Both Q and E got little cast time to cast *Never tried the tier 1 branch 1* and also for back flip a.k.a SS which only give invul when your chara is not touching the ground, which i believe its hard, if the player got high ping.