Huh, I’ve not had that kind of trouble. The only thing that’s been difficult for me was swapping the regular arm for the light-up saber arm. And while I wouldnt call it easy, after I’d succeded in swapping it a few times it’s become much more manageable.
As for posing the figure, of course the costume is more restrictive. All 1/6 Vaders are rather restricted in motion. Also, the leather body suit is quite stiff fresh out of the package. But if you work with it a bit it gets “broken in” and becomes more flexible. He’s always going to be limited due to the multiple layers, armor, etc.; but I haven’t had an issue getting some nice poses out of him.
I love the cape. It’s heavy and drapes very well.
I’ve read several people having trouble swapping the hands, but I haven’t really had any problems. You have to push them rather firmly, and it helps immensely to get the arm into a position where you can apply steady and quite firm pressure. But I’ve swapped out all the various hands now and I’ve gotten every one on and off the peg without any major difficulty.
As for the sculpt, to each their own. I certainly won’t say it’s perfect, but I think it looks pretty great. In hand, the only complaint I’ve got is the tusk angle. And with the right poses, you can minimize the impact of that issue in person.
Personally I think the figure is awesome and has way more positives than negatives. I’ve been very happy with my purchase. But if this one doesn’t float your boat, there’s three other Vader figures from Hot Toys and each of them has their strengths.