tl;dr: yes, Rev is still viable, even in Condi, but it is probably not meta anymore as it has too many counters now.
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Revenants are in a somehow tough spot since the last balance patch as one important retribution trait AND the Shiro Heal got nerfed. On the basis of this, two observations can be made: a) Stability now requires skill and sometimes a little luck, b) one major damage combo of Power Rev has been nerfed and requires better timing → more skill. Still, Power Rev – especially running invocation over retribution – is pretty viable against most of the classes running. The damage is still ridiculous and may be important burst damage in team fights. Also, Invocation offers some defensive capabilities now needed as Stability from Unwavering Avoidance is not guaranteed anymore. I sometimes also play Mallyx over Shiro as Boon Corruption, Resistance and a better heal work sometimes better than Shiro’s CC Elite, additional mobility and better burst damage. But that depends on the team’s compositions and personal preferences.
The obvious counters (Mesmer Condi Shatter, Guardians, well played Berzerk Warriors, sometimes boon corruption Necros) are still issues and will probably be longer. Additionally, since nerf of Unwavering Avoidance, Thiefs are really contagious now for Revenants.
But except for guardians, the counters can be handled by playing a variation of the old Condition Revenant, since so many people ignore Torment and Confusion. Right now I’m playing same traits as before with Mallyx/Herald combined Mace/Axe and Staff and its pretty fun out there. This combinations ensures incredibly high survivability and good condi burst against any class except for guardians since they can block nearly any attack – even if facerolling. Obvious counters: High Boon Corruption and chain cc. Still, I feel more comfortable with this build than with Power Rev. Also, it is a little harder to play than a Power Rev as it requires better energy management.
Conclusion: Power Revenant with Invocation over Retribution is still viable, but requires more concentration and less faceroll. Running Retribution costs a secured condition remove every 10 seconds which is really important now and just delivers a skillful stability boon. Condition Revenant seems more viable than expected and has fewer counters, but is harder to play and requires a high focus on defensive capabilities over big damage.
