Abilities are meh (1% per skill activation is pretty bad, probably among the worst and Solar Blast buff is decent if the team is built around SB) but that's 4 equip slots, and hopefully at least one skill up on a HP-drain skill. Cactace and Leucocoryne in the same draw. LOTS of people would like to call that their "worst luck".
Take note one of the main reasons event gold units can even compete with gacha ones (note that outside of the first 3 event girls, the abilities and sometimes skills are generally watered down versions of the gacha versions) is because they come with max skill and equips (assuming event completion). Your Gerbera has all 4 equip slots (lot of potential extra stats there) and with any reasonable luck one skill up (maybe more if you're lucky), again, with an HP-draining skill. In that state she's perfectly viable despite her meh abilities, unless you've got more of that "bad" luck that's stocked up your teams with better 5 and 6* girls.
Also note, Leucocoryne heals team on pest nodes after evolution (valuable in a lot of popular farming maps, and plenty of event ones too) and her pre-evolution ability buffs her attack whenever ANY team uses a SB in any fight on the map, and Bridal Cactace buffs her own skill activation rate by 1.5 (on a skill that hits 2) and buffs team attack against bosses (stage, not raid). They're both good draws.