Thats no big deal. Io cant spam 2 of her abilities at the same time unlike cassie+ the dps of her gun is lower than cass by almost 250 while her healing needs to be focused and isnt that strong but balanced. Like she doesnt have cass Q ability to do 1000 burst dmg at same time or anything similar to that. Making the comment just after playing her once or thrice is not valid or constructive
enough to make that opinion on her dmg. I suggest you give atleast 6-10 more hrs to her before making that big of an opinion cuz rlly her dmg isnt that high but balanced along with her heals.