I think you should reconsider the 3rd one, you don't have to put an "Unlike" thingy button only positive ones.
Could be similar to how games like CS:GO have a reputation system.
You can only commend for:
1. Good teacher
2. Good leader
3. Friendly
Of course these could be changed but like you said there is no need for a down vote button.
Exactly. This is a pretty good idea.