It's sad but true. And I think it's this way because they took away what made Sam interesting and basically neutered him. He's most interesting when he's either interacting with Cole or going over memories with the other wolves. Grace always was a bit annoying but giving her what Sam had didn't make her any better and in the end all they do is mope and smooch and blah blah blah! There's never any conflict between the two of them and Sam's biggest problem is that he can't admit that they might have made a mistake with his bogus "cure". Being a wolf was a part of him and there's just no conflict there. He stubbornly refuses to believe that being a wolf was something that made him who he is. At least Cole and Isobel are an honest match.