I used watchman for ranked PVP back in patch 1.3. It was definitely viable back then. The dots actually tick very strong. The dots aren't the problem. TBH, almost no medics on Pot5 cleanse dots. Cleansing dots is usually a waste of time, since a heal could be being channeled instead, and watchman's dots reapply super fast.
Same here. The spec certainly isn't inherently ill-designed for PvP as some claim, it just needs some attention.