I play MF regularly and I love her ult. the damage isn't that great late game, but it's still good enough to force people to either take the aggro or try to move out of the way while the rest of my team is damaging them. the bad part is that it requires you stay still, so if your teammates aren't doing their job then you're just going to get focused immediately which is not what you want as an ADC
The problem with MF's ult is that you have to stand still for the full duration of it to work. If you get dived by someone while you're trying to use your ult, you're gonna have to cancel it.
yeah, her s*****y ult must be the reason for her 55% win rate
It's range is pretty god damn big. Position yourself better and/or yell at your team for letting you just get dived. It cremates any team just sitting in the damage especially if you have a Black Cleaver.