The only way PvP will prevail at this bracket is by community made wargames for both bgs and arenas. Wouldn't be the first time a bracket has had to do this, prob won't be last.
20 is always a safe option. Always a community for it. Whether it be PvP, or PvE focused. Plus I'm sure there's still some 20s wargames going, or some in the works. At the end of the day the choice is yours, so have at her.
Rogue damage might not be the greatest but it could still put in work if played right. Odin and Dizzen both performed very well on the class, when it was lacking alot.
I dont know if anyone has pointed this out. If you don't have a slow fall ability, and would maybe like one. Can always buy noggen floggers for the slow fall effect off the consume (1/3 chance). I think it lasts, for like 14 seconds