I don’t think Sentinel is a bad subclass,
(in fact I really enjoy using top tree with Synthoceps or ACD/Feedback Fence) but the issue is in the super.
The super suffers from some serious hit registrations issues. This problem plagued Bladedancer in D1, and its affecting Sentinel too. I even saw a couple instances of this on Spectral Blades too. It may be possible that this is something Bungie is struggling to fix, but they need to prioritize finding a solution to this problem.
Sentinel could also use is a small speed increase for the attack animations. The swings feel so very slow.
TL;DR
-Fix hit registration
-Slightly speed up attack swings
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I often wonder how much better the game would be if it wasn't always online. It's really depressing this is becoming the norm and being disguised as a "live game" instead.