It's not just you: Mercy was completely broken in the Overwatch 2 beta
For the first three days of the Overwatch 2 beta, Mercy couldn't heal properly. The game's most popular healer had a bug that prevented her healing beam from chaining to allies during her Valkyrie ultimate, squashing any hope of saving her team during a hectic fight. Blizzard issued a patch that fixed the ability today, but a list of problems remain for the support character, which are detailed in this Reddit post by user ihatemouthwash.
I noticed Mercy's wonky behavior myself while playing the beta this week. Valkyrie is supposed to increase the healing rate of Mercy's beam and spread out across your team while also allowing you to freely fly around the map. It's not uncommon for your allies to die during it anyway, but it was hard to tell why Valkyrie was less effective than in the original game. The time-to-kill in Overwatch 2 is noticeably faster without a second tank to turn around and help you out, so I initially attributed it to that. Now that it's fixed, Mercy should at least be able to keep up with the rest of the support roster, but that's not the end of the story.
Mercy's signature ability, Resurrect, is inconsistent in the beta right now too. Players are reporting that it won't work within its intended range, its cooldown is sometimes reset for no reason, and that the animation for it can stall out and interrupt the ability. The new, contentious scoreboard also doesn't seem to correctly reflect the amount of damage Mercy's beam has boosted while attached to another hero. An alternate setting that allows Mercy to fly to teammates while healing someone else seems to break occasionally, too.
Outside of the now-fixed Valkyrie bug, none of Mercy's problems are game-breaking on their own. It's possible they could
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