I like Lae'zel, well I like all the companions . . . I guess Wyll being the least interesting.
I want to like her, and she's quite an interesting example of her culture, but she's basically 90% diametrically opposed in approval/disapproval with Shadowheart, which makes party dynamics too hard to juggle.
Having both Lae'zel and Shadowheart in the same party is fun, I love their banter. It's not overly difficult to keep them both happy. They are both pragmatic. You can avoid most of the negative hits by being neutral in dialogue. You can do all the good helping people things you just can't begin the conversations with the "I will gladly help you with whatever you need" options.
My mostly neutral warlock had to choose between Lae'zel and Shadowheart for a romance partner.