I don't think its important to like your T as long as you are able to go and feel like you are making progress. Even dreading to go is ok as long as you can work around that. If you do feel like it is something you can't deal with or want to work on, you could always bring it up with your T. Maybe there is something that he/she could shift or maybe it would be worth exploring why you don't like him/her and working through it that way? I am a huge fan of transparency in therapy although I will also be the first to admit that its hard as hell to actually put into practice. Good luck!