Pros
High AoE Damage
Molotov SMGs are among the strongest options for AoE damage against groups of linked enemies in the early game, and Vector's 5☆ rating combined with her decent 30 Damage makes her excel in this role.
Best Dragger for 13-4
Thanks to having 5☆ multipliers and good base Damage, a 1-link Vector with some Damage buffs from tiles and Fairy aura makes her the cheapest 13-4 Dragger option, as resupply costs scale with links.
Strong Tiles
25% RoF is quite good for whichever AR is behind her in normal echelons.