Hybrids are OK as long as you let them know who's boss. The problem is a lot of them tend to have health issues (usually bad hips). I know a couple that had one and he was really good natured up until he got old and started to be in a lot of pain, then he started to get snappy.
Half Wolves are a bad idea. I was attacked by one owned by a friend when I was a kid and it tried to tear off my leg with no warning whatever. Turned out that 'dog' had attacked others before for a total of 80 stitches worth of bites. They had to put it down. Sucked for everyone involved.
Yeah, the problem with wolf hybrids as pets is that in general, they have the intelligence of a dog but the need for pack structure and vicious hunting instincts of a wolf.