Here's a major plus for SL PVP: 90% of gear is class specific.
Basically, this means that balancing classes in PVP is very simple--adjust the stats of gear for each class.
Did the update make Engi's OP? Yes, but it's not best to just give Engi's their turn to dominate... It's just not ideal.
All STS has to do is tweak the gear stats some, solves everything. Too bad it's not that simple in PL...
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