Least favorite is anything with stupid characters that even as a baby were unable to find the tit to nourish themselves. Oh noes, a guy wants to kill me! There is a huge group of people here, so better run to some abandoned building and then corner myself, quickily!
I'll turn you off and never wath again
Favorites?
Slow burners that just give you the creeps for a long time.
Also super natural horror, as long as it's done intelligently