I didn't recognize her in Watchmen until the sex scene and her passionate legs up performance reminded me of the girl from Heartbreak Kid and suddenly the familiar tingling in my pants made sense: Click! That's who she is! Hot chick from that Ben Stiller movie!
I thought she was perfectly fine in her Silk role. Never bothered reading the comic, of course, so maybe she didn't nail the literary character, but I didn't find fault with her acting, per se.
And damn if she wasn't a smoldering cinder of hotness whenever she stepped on screen. I was surprised the film stock didn't warp and melt, then I realized I was watching digital and that explained it.