User blog comment:Nerdyanimegirl225/The Worst. The Best, and why?/@comment-24748439-20140525134406/@comment-24066070-20140525171636

Lucy isn't weak, her biggest weakness is her stamina and this has improved considerably. Furthermore, the plot usually asigns her to battle an unimportant sidekick, whereas Natsu and Erza hog all the big bad villains and let's not forget she often "only" serves as fanservice.

All these things damage her credibility as a powerhouse.