Any dick is too much if it's used improperly or too hastily. By the same token, even large dicks can be a wonderful experience if they're used expertly. I've been with guys with smaller ones that freaking hurt because they rushed too much. I've been with guys with larger ones that were thoughtful and took it slow and it was easy in comparison.
I'm around 8-8.5" depending on how turned on I am. If the wife needs it hard, I rush more. If she is sore, I go slow. Either way the motion of the ocean is good for what is needed.
This is a big penis website, so big ones are highlighted. Ideal is a big one wielded by a man who knows how to use it for pleasure, not to prove something.