Quislet, I agree they totally telegraphed the ending with the challenge and the means of the villain's defeat. I found it to be an entertaining flick, but I think they went too light-hearted with it.
You don't read the comic, but this is definitely a different animal in terms of its tone. I appreciate the cute bits, but that stuff worked more in the first film because the counter-balance was more of a contrast. This time out, the "serious" parts weren't enough of a contrast, making the whole thing seem too light.
And I thought they were too heavy-handed with the soap-opera/nobody-loves-me-because-I'm-a-freak relationship stuff.