Now it does give you WOW, Love and other things in the regular LIKE button, but not a Dislike (Thumbs Down) button. But in the chat window, Facebook does give you a genuine Thumbs Down button. How to get it?
In FB chat window, click on emoticons button.
Now you will see the emoticons which are available to you by default. Go to the FB emoticons which are called “Likes”. This has many related icons, including “Dislike”. That’s it.