Wolverine's claws have long been pimped as being able to cut through anything. Read any issues of Uncanny X-Men prior to Claremont's departures and you'll see numerous references to that point. Other than his first appearance against Hulk, he's been quite consistant as far as I know in being able to cut through people/things. The only reason he doesn't generally do more than scratch people is because he'd end up maiming or killing almost every character he's fought. That level of violence is generally not done in Marvel and certainly not against a-list characters.
| > If Wolverine has trouble cutting through the hide of Gravage Hulk what makes you think he can "lop off" Thor's arm so easily? Thor has a durability around that of the Hulk, if not better, but just lacks the healing factor. I think Wolverine cut probably penetrate Thor's skin with the claws in a stabbing motion, but swinging them isn't going to have the same effect. Superficial scratches perhaps.|