She's just bottom tier because there are very good characters in the game with a lot of good and easy options, she is perfectly viable and a good character, just not as good as most characters in the game
She's the "worst character' in a game with pretty good balance. Her lack of reversal and ability to be EASILY DI and parried are the only issues she has.
I really want to know why ProblemX pick Lily, she's not exactly ""good"" in theory yet he picked her anyway. Is it due to the low pick rate and he's taking advantage of that? Is he going to pull a "Panda" moment on evo/cpt with his Lily? 🤔