One example I like to use of this is Hugh Jackman as Wolverine. People complained that he was too tall for the character. Oh, they complained endlessly. Yet, I'll bet a number of those same people had tears in their eyes at the end of Logan, as Hugh's casting as Wolverine was perfect. He looked enough like the character but, more importantly, his acting was spot-on as Wolverine. He had the essence of the character, which is way more important than his height. I'm sure there weren't any 5'3" (Logan's actual height, according to the Marvel Wiki) guys available who could have played that role as well as Hugh did. So, he was a bit tall. Who cares?
I initially complained about his casting, but all was forgiven when I watched the first X-Men. He perfectly captured the essence of the character, to the point where, as you said, most people probably forget than Logan is actually supposed to be short, stocky and Robin Williams level of hairy.
Also, I'm so glad we have gone away from the early 00s practice of black leather and have finally embraced the colour costumes from the comics. I mean, how awesome does Benedict Cumberbatch look as Dr Strange. If ever there was a costume that would look on-screen it would be his. And yet, with the eastern martial arts influence with the costume, it looked amazeballs.