Is true, or, that is how I see it as a character flaw on his part.
And seeing his intent is to basically corrupt Gomamon into a total perv, that is, his kind of perv, even during the "good" route, I'd call him a bit of a antagonist, and is not meant to be fully liked. If you don't swing that way.
As for me, I don't, and felt he had been a bit too much of a jerk to Gomamon for repeatedly poking fun at him by referring to him as a girl even throughout the "good" rout.
But all in all, it did not put me off from enjoying the story any. And he was rather quite redeemable most of the time, if you chose his actions wisely.
I do happen to like dark, so in my own way, I did enjoy the "evil" rout too. Wile knowing the mane guy was going to be an extra mean antagonist to Gomamon, to turn him into a total broken submissive in the end.
I too felt he could have been a bit nicer to Gomamon during the "good" rout, but then it be me making up the story as to how I want, rather than taking the story as written. And is never the right way to think when reading someone else's work. Is not fair to the writer. As then, it would not be writer's story anymore.
He is what he is meant to be. A person who is not perfect, and not always nice.
If I wish, I can just imagine him to have been nicer on my own, in my own made up version of the story played out in my head. And that is more than enough. It's what shipper of fan-fiction do. Or, at least, I do. ^.^