There is no limit to the amount I love to consume these types of books. 

As long as the author doesn't purple prose it or try to slooooooooow burn it or make the FMC too angry or too "independent".  Throw in a BFF if they get too tough.  But the FMC needs to be smart.

The sex scenes should be plentiful and explicit.  

And if there are wolf shifters and vampires they absolutely need to be balanced by other mythical beings.   

If it follows the right formula it's an automatic 4.0 and more if the characters get more lovable as the novels progress.  Bonus if it makes me cry.