Let's switch her passive with Zed's passive. She gets some execute ability since she has low base damage, and Zed doesn't get to blow everyone up in mid since the mana regen nerf.
^^ That was J/K. But seriously, it needs to be reworked. You can't use it in laning phase because cs-ing minions disables it, and in teamfights you only get your first crit guaranteed, and it takes a long time to build up to the next one. Seriously, Focus at max level is 8 stacks per second. So at 50% crit chance, you need 50 stacks to reach 100. That is 6.25 seconds without AA during a teamfight to get a second crit on her passive at max level. Mid game with 40% crit chance and 6 Focus stacks, it would take 10 seconds of not AA to get a second crit from her passive. You have to cs in lane, so it is worthless there most of the time as well.
Meanwhile Caitlyn gets "Every 8/7/6 basic attacks, Caitlyn will fire a headshot dealing 150% damage to a champion or 250% damage to a minion." Plus a snare and a jump to escape. Caitlyn is definitely not OP from this, and Ashe could some work to be viable on this level, too. I think Riot can do better and give her passive some love. Hopefully they check some ideas here, and keep the rest of her kit the same. We don't need any 'compensation' or 'reworks', but I do enjoy Ashe but feel like her passive is holding her back from being viable. I can't remember the last time I've seen an Ashe do great in SR, decent sure, but not great.