Unit Analysis by Team BethelFrankel
Class
Detonator with mapwide AoE, stun, and damage amp.
Overall
B+
(A at R3)
Advantages
+Relatively decent equipment for team support if set-up
+Potential global stun and AoE nuke
+Great for farming at MBT
Disadvantages
-Stun is extremely unreliable without setup
-Really long CD
Explanation
Stun can sometimes be used to cheese mechanics, and having some access to it can be useful, but not if it it's this unreliable and at this much of a cost to DPR. That said, Barbara can provide some Sniper value from the fact she has a global, enemy targeting nuke and the fact that random stun can be useful for sustain. If Fire were more setup for long ranged conversion, I think she could be slightly better, but otherwise, Barbara is mostly fine, if a bit niche.
Note that MBT gives her the best Global Nuke in the game, which makes her very good as an autofarmer for your obnoxious mats/nightium. Worth an investment as a QoL unit if you're endgame.