I'm on the "huge" side of things in both length and thickness. Most of the girls who enjoyed mine tend to do so because of the thickness rather than it being long.
The girls that didn't like the girth didn't like it because :-
1) Pain when I put it in.
2) Pain after it is over.
3) She felt it was too dominating especially when I kept going deep in her and she felt all submissive and unable to control anything.
4) Reminded her of the pain of being raped.
I usually push hard so at least half of the penis enters her, many girls have liked it as they enjoyed the feel of their vagina suddenly being filled up and also the hurt that comes with it. Some screamed from the pain but still liked the feel. I'm also rigorous and rough when I thrust usually do fast, deep and long strokes.
Most girls aren't quite as fragile as what we think, they have very high tolerance to pain.