I mean the difference is MF fir all her dumb oneshot-qing FEELS fair to play against, she's immobile with barely any self peel and her only great strength is her teamfighting ult shreds teams sometimes more reliably than alother adcs can with autos. I'm not saying she is balanced, but no one stands in a mf ult for 3s and says "that was some bullshit" when they die. People however will 100% get rooted by senna from 1200 range off a minion, have their team dive on her and senna heals herself and goes invisible and slows them and gets a small ms buff and even if she actually outplays them to get a double or triplekill, they look at all the utility she has and things she can do and they say "yeah, that was 100% some no counferplay bullshit" completely ignoring they come with flaws too. And I fucking hate senna, but that's why it be like it do