It's OK but it's a little odd. It makes it sound as if the only successful thing about it was that everyone turned up. The suggestion is that the rest of "it" was not a success.
Was your party a success?
Well, it was a success in that all the guests turned up. But there was a fight, a window got broken, I found my girlfriend snogging another guy in the bathroom and someone spilt blue curaçao on the white carpet.
HEY! That's my kind of party!!! :-D
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