The largest dick I've ever had was a little more than 10 inches long, while between 5 and 6 thick. I wasn't accustomed to such a size, and tried to take him as deep as I was used to from the others, but that caused a real hard pain the moment he went deep: A true mood killer. It just isn't as much fun, also for the guy, if he permanently has to control himself not to push to hard, go too deep, and so on. 10 Inches is eye candy, real eye candy, but when it comes to fucking it becomes a problem.
On the other hand, guys in the range of eight to mid-nine's hardly differ when it comes to the feeling. And on the plus side, I'm very accustomed to those sizes among my "hung" partners, so I know what to do, and the fact that we don't have to be so careful as with a larger guy improves the fun a lot more. You understand what I mean? Pleasure can be heightened by length, and by the circumstances. But here, the circumstances make the pleasure grow a lot more than the size does.
Disappointment is a funny thing in this context. My first two or three partners were above average, my first one really big even, so, being completely new to sex, I thought... THEY ARE NORMAL! That caused some disappointment with partner number four, who was maybe average. A funny story, I laugh if I tell it nowadays, but it's true. Throughout the years, however, it has normalized. I appreciate large dicks and like them, but I'm not "disappointed" if he isn't quite as big as I'd like it.