Running with:
http://swtor.askmrrobot.com/skills/Sentinel#9fe828clc-22k-6
Ya, only having 1/2 close quarters is stupid. 2/2 serves as another interrupt. Between a 6sec kick, 12 second force charge interrupt, force stasis, and awe you can chain interrupt a caster down hard.
I don't bother with inflammation despite the 50% snare buff it got as the snare time only lasts 6 seconds and cauterize's cooldown doesn't always reset with merc slash/slash in time to reapply the snare. Bioware should really move that talent up the tree and have the snare apply for 12 seconds so we don't need to leg slash anymore.
Jedi crusader is worth it imo. Rebuke has a short cooldown and watchman in PVP can blow the focus fast.