Not necessarily a good word.
Lin Daiyu is a character in A Dream of Red Mansions, a very sensitive, fragile and vulnerable female image. Her personality and experience also make people feel sad and sympathetic. Therefore, if others say that you are like Lin Daiyu, it is likely to imply that you are too sensitive, too fragile, too emotional, or satirize that you lack opinions, are easily influenced by others and are not strong enough.
Of course, it may be similar to Lin Daiyu's praise for your beauty and cleverness. In short, the meaning of this sentence needs specific analysis, and it needs to be judged whether it is affirmative or negative according to the context and expression.