I would grade season 4 a C. for the following reasons
1. I liked that they introduced Silas
2. I hated that he was only 2,000. He couldn't have had the first headstone at the age of only 2,000
3. I didn't like that Bonnie was related to Qetsiyah. This the 3rd super powerful witch she is descendant from.
4. How easily Elena and Jeremy killed Kol was stupid.
5. I liked they brought Hayley in.
6. I didnt like that Tyler left because he leaves and comes back for like a episode.
7. Hybrids were killed off to easily, besides when Klaus killed them.
8. The hybrid Chris shouldnt have died.
9. Vaughn should have been on longer.
10. Silas psychic powers were cool but we should have seen more.
11. The dead supernaturals that came back didnt do anything. Only the Five actually did something.
12. Jeremy should have stayed dead. He has been brought to many times and holds no perpose after he completed his mark.
13. Bonnie should have came back.
14. The worsed thing is that Stefan is Silas' doppleganger. Now watching Silas is just going to be like watching Stefan be the villan.