PVP archers are for hardcores or whales right now.
If you intend to be either of the two, then feel free to do so. The only archers I’ve seen in high ranks are those with super-endgame equipment (orange 315, solmiki) with nearly maxed or already maxed transcendence.
If I’m to rank the trees based on ROI (by investment I mean the time you took to grind for gear or the money you spent to buy them):
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Cleric / Wiz - depends on the build. KinoSorcNecros are annoyingly OP right now because of the summon buff as well as the MF stuck bug. Cleric master race as always.
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Swordsmen - not all builds. Murmillos dominate, followed by a few Lancers, rare Doppels here and there, and then other builds. There’s this one Catagoon in SEA with very endgame gear that’s doing fine but not really good ROI.
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Archer - Well-geared Clerics and Murmillos can kill you in seconds or even OHKO. Well-geared Wizards can tank your burst skills. The only way for Archers to work decently in TBL right now is to have really, really good endgame gear. The builds I see are SRs, Cannons, Falcons, Hackapells, and at rare times a Musket.
SR is probably the cheapest among those builds to take (though still expensive compared to other trees to work on its own) but that relies on you getting lucky with matchmaking (e.g. you have a good Cleric and/or wiz in the team). Falcons used to be good in 5v5 but they aren’t doing as much impact support-wise in 3v3.