I don't see the appeal. Playing Revenant is like playing base game elden ring as an extra squishy phys/faith build but with access to a slow rechargeable spirit calling bell instead of one time use.
Every other class has something going on that's new and fun and allows you to keep up with crazy boss gimmicks, Revenant has summons that do less damage and die faster in a fight than a max level spirit against pre-nerf Consort Radahn.
If she had a one time death gimmick like wylder where they'd go down like skeletons do and self-rez if not struck again that'd go a long way towards making them more appealing. Every boss has massive aoe spam so it's not like it'd be that broken.