That's when the fact that it's comics comes into play. A high class snob turning to diamond might be a one off joke, but it stuck around and I don't mind it. The Beast transformation worked for a minute in making him uncomfortable in his own skin again. That said, I'd much prefer a return to any of his previous appearances. The only one that I've not liked is Angel's new healing powers. They make him more of a valuble member of whatever team he's on, but they've been ignored by writers when they could've been helpful. Either use them or retcon them.