I feel like some people severely misjudge Luminara Unduli, and this seems to stem from her and Anakin's differences as highlighted in the episode "Weapons Factory."
I wonder if people take Anakin's accusation that Luminara had "given up" on the padawans (after the factory explosion) as fact, and don't listen to Luminara's own rebuttal that she had not, in fact, given up on them, simply that if they had died she was prepared to let them go - i.e., mourn them, but also celebrate their memories.
(Seriously, those are all statements Luminara herself makes during the episode.)
If Luminara had, say, argued with Anakin that it was all a lost cause, ordered that the recovery machinery be turned away, insisted that Anakin ignore Ahsoka's message, and refused to help Anakin free the padawans, I could maybe understand people saying she's "cold" and detached and doesn't care about Barriss and is an example of why being unattached is a "bad thing."
But she doesn't. She doesn't abandon anyone or give up on anyone. In the face of Anakin's budding frustration and anger, she simply asserts that she is prepared to let people go when their times come. And since it turns out the padawans' times have not come, she helps Anakin rescue them.
(As an aside: yeah, she was wrong to refuse Ahsoka's help in facing Ventress in an earlier episode. But she openly admits to her mistake. And her mistake occurs after Ahsoka had been impetuous and reckless multiple times already on the trip (Luminara had just saved Ahsoka's life when Ahsoka was about to jump in front of a rapidly descending lift, right before Luminara goes after Ventress), so I can't really blame Luminara for not being keen at that point on taking an impulsive teenager with her to a fight against Ventress.)
Just saying, maybe we can take Luminara's own statements and assertions about herself and her feelings as fact, rather than relying on second-hand (and incorrect) assumptions from Anakin to understand her character.
