Jackman is doing an excellent job with the material he was given, make no mistake about that.
He was, however, miscast. One of Logan's tradmarks was that he was so short, and I think the studio just didnt think that a short guy could come across on the screen the was a taller man could.
I could see how they could think this, and I can only assume that they TRIED to cast a more realistic Logan, then just decided it wasn't gonna work, and maybe they were right. That one dude, "Hypnotica" or whatever the crap he calls himself, LOOKS dead on the part, but I hear he can't act. I had even heard that Glen Danzig was considered, for however shortly for the part. That would have been....interesting.
The point (and I did have one, I think) is that studios have to weigh the pros and cons of each decision, and run with what they think will work for the widest audience, and that is why we dont see comic books literally transposed to films. They are translations, not transpositions. And yes, that will make purists mad, but purists must realize they are COMIC purists, not movie purists.