Ha, funny, I feel exactly the opposite. The first Dumbledore looked too much as if you could break him by just breathing at him. I was constantly worried he was going to drop dead in the middle... of... a... sentence. (With all possible respect to the actor, who actually did die.) Michael Gambon portrays Dumbledore as the strong and slightly weird wizard he is - from book 4 onwards we don't get to see the silly Dumbledore as much in the books anyway. Yeah. Dumbledore 1 was way too croaky. More importantly, he becomes more energetic and involved in the later books.