Depends how you define expectations. If you are talking about expectations in yourself and the way you act and react then yeah, I reckon it is a good thing to have expectations because it is something you have some control over. You can expect yourself to be strong, or brave, or honest, or truthful or whatever you think you are or should be.
But I think it is silly to have too many expectations about your life, people and the world. How can you have expectations for something you can't control? You can expect rain tomorrow but it's as likely to rain as not. You can expect people to behave in a reasonable fashion when the chances are they won't. You can expect to live for another day but that doesnt mean you will. You can expect your friends to be honest with you and support you but there are all sorts of reasons good and bad why they won;t always be able to.
I think that you can have hopes and dreams and wishes and desires and you can and should reach for the stars but you can't expect to touch them