I'm not really sure i'm liking the hybrid... My thoughts
Offense:
My DPS is excatly the same in hybrid and defense, when testing on operation target dummy. Witch is around 590dps (NO BUFFS, not even my own!!!!!) (varying about 5DPS during my 1 hour test session)
AOE is alot better with Defense, TBH the Hybrid can't really tank packs....
On the defensive side:
Hybrid gives 4% reduction to all damage. Focused defense with 15% extra it a nice CD, if you learn how to use it, it kinda needs to be timed with both taunts.. 3 secs lower CD on Blade storm/blade barrier
Defense has 4% reduction to elemental and internal damage, 4% shield bonus and 5 secs longer enure.
Hybrid has an advantage here. Not sure how big it really is....
But i hate losing the ability to hold AOE agro from Hybrid...
Hybrid: 18/23/0 - http://swtor.askmrrobot.com/skills/guardian#21j1k2i-211i22ek3-0
Defense: 31/7/3 - http://swtor.askmrrobot.com/skills/guardian#1fd2djdk2i-223-21
I'm in full campaign gear - full tank.