I like the series as a whole. A little too "M-rated" for me though.. Too much gore & sexual talk. But the fact that something woth both of those things has hooked me is saying something, as one or the other--especially both--usually turns me away.
And, while I do like the series as a whole, the RPG mechanics in 4 were too dumbed down, and I despise the most recent installment with a passion.