Cinderella is my second favorite Disney Princess, behind Snow White, here I'll be explaining why. Keep in mind that this is my opinion, and we may disagree, so respect my opinion and I'll respect yours.
I love Cinderella for multiple reasons. For one, I love how kind and patient she is. She's had a lot of bad experiences in her life, and yet she can still remain kind and patient despite that. I really admire that quality in her. I admire a lot of qualities in her, a lot of which I don't have myself. It makes me respect her more as a character, and it helps me strive to be more like her. She is personally a huge role model of mine. I think it's a good balance in her character however, how she isn't all JUST kind and patient. She can have a bit of a sassy side to her as well. Maybe not as much as somebody.. *cough*Jasmine*cough* but I like how it's more just a part of her personality more than her personality as a whole.
I love how mentally strong she is. She is able to put up with her horrible life and still keep a smile on her face throughout it. She's definitely, in my opinion, the strongest Disney Princess mentally. She knows what's happening to her, but she doesn't let it get to her. She stays strong throughout her life, and in the end, staying like that, and being kind and patient, pays off for her. She is able to get her happy ending.
Like I said above, one of the main reasons I love Cinderella is because I admire her as a character. I really do. I think that it was very hard to stay kind, patient, and as strong as she was without pretty much going insane.
And NO, I do not think she is a pushover. She stands up for herself when there is a need to, and the rest of the time she doesn't, but does that mean she's letting her family walk all over her? No, it means she was smart enough to realize there was nothing she could do about her life, and that just trying to make the best of it was the only good solution, in my opinion.
No I do not think she is boring either. She has a personality. She is also a very unique character in my opinion. There's a reason she is so iconic, and I believe that it's because the type of character she is influences a lot of people. There are a lot of characters out there that are like her, but they came after she did. She was a unique character at the time, she was mentally strong, but kind, patient, and doesn't let people take ~complete~ control over her.
Out of all the Disney Princesses, who I truly believe all deserves happy endings, I think Cinderella deserved her's the most. She went through the most, but she never became bitter, cruel, or even rude. She knew what was going on around her but knew that there was nothing she could do, so she put up with it. She did was she was told, but when times became unbearable, she was able to stand up for herself. That is why Cinderella is my second favorite Disney Princess and why I love her so much.