I have to admit that my reasons for liking Dora are pretty selfish. She reminds me of me. Or, to be more clear, she reminds me of the "me" I was when I was making foolish romantic choices.
I think it's clear, given the recent strips, that we can now say that Dora was right - Marten was never truly in love with her. He is in love with Claire. He was in love with Faye. He was on his way to falling in love with Padma. You can see the difference in how Marten is acting with Claire now, his preoccupation with Padma and his Faye-phase. He thought Dora was hot and he was gratified that she was into him, but he had no affinity for her otherwise. Dora, on some level, knew that but she hoped for the best. She got her ass handed to her on this board when she ended things, but she was absolutely right to do so. Marten was never going to feel for her what he feels now for Claire, what he had felt for Faye, and what he was starting to feel for Padma.
I've made similar errors in judgment and like Dora, stayed way too long in relationships with men who weren't that into me. Jeph writes a realistic portrayal of a woman disappointed in love, but not jaded. She still puts herself out there, she knows that she's hot and that she will find someone that will be "all in" with her, which she has in Tai. She's tough, smart, and a good representation of a Millenial business owner in wanting her workplace to be one of acceptance, tolerance (with some limits), provides comprehensive healthcare for her employees and cares about their well being. She's got major self esteem issues, which has probably led her to choose people like Marten who are lukewarm on her, all her life, but she's trying to work through them. She's aware of her flaws, and while she may handwave some of them (ie the upcoming Svenectomy), she does desire to be a better person, employer and friend.