I keep saying that I dislike Tsundere's but some have been growing on me, like Taiga (even though Minori best girl and I love her) and Senjougahara (though she's a "healthy" mix of Tsun and Yan that I can appreciate).
Taiga just being Taiga (I wouldn't say anything bad about her dad). Senjougahara is a ... I don't know how many types of dere she has but she has the manner of a good woman. ie, She make Araragi donuts as encouragement (without any tsun added).