It was... poor, not abysmal, but almost there. Forgiving the inaccuracies to the marvel universe, however blatant and horrible they were, some of the biggest parts of the story got given the most laziest attention. In particular, his memory loss, seemed like they rushed through the entire movie and thought "**** we forgot he has to lose his memory", and then put something together in 5 minutes. I also was left feeling that they missed out on a brilliant chance for character development by skipping from a short scene as a kid all the way to the Vietnam war. Instead of a montage, they had the opportunity to show his actual origins, to show his coming of age, and also show more of how his brother was becoming more and more unstable, and the relationship they had. As it was, his past was really weakly done and inevitably lead to a weak portrayal of the lead protagonist and lead antagonist.
It's weird because I quite liked Jackmans performance, if he had a better iteration of the story, and some less cameo and more content, this would've made a great movie, but as it was, it fell short.