Honestly, no. IN the moment, I'm pretty much always enjoying it. I'm one of the lucky girls who can orgasm any time the wind picks up, though.
A few months after a relationship, though, once the haze has cleared, it's not unheard of for me to say, "you know? He wasn't objectively that great." That usually comes more if communication wasn't very strong.
But heat of the moment, no, I'm usually enjoying myself, and I'll say so. And if I'm not, I'll also say so.
Some guys have actually told me they wished I was less easy-to-please, because given how well I can communicate what they want, if I was pickier, I'd be a great technique teacher. Oh well, I'll take what I've got and be glad.