I don't hate knights has much as other cards (yes, 5 of cups, i'm talking about you), but they are not the cards i like the most. I understand your point and your aversion to them, but i wouldn't say the knights are about masculine energies, they are really neutral for me, and i don't associate masculine traits with lack of sincerity ect. (although i agree they have more often commitment issues than women).
knight of wands : i undertand what you said about the knight going away from you, i have seen this card as something, someone going in the other direction and not toward the querent. It is also one of the typical non commitment card for me. However i don't hate him because it can also bring something fun and nice to you. Of course it doesn't last but at the moment it is pleasant. And i lack his energy so sometimes this card pops up to remind me to be a little more impulsive.
knight of swords : in my reading it's really often about arguments, anger, resentment, someone blinded by their opinion and unable to see and hear others point of view. I've seen a lot of post here where people see him as a message quickly delivered to the querent, but this knight never shows up for that in my readings. However it can also be about you and your need to stand your ground and show your opinion in a specific situation.
knight of cups : he can be nice this one, he can be very romantic and i've seen this card for the early stage of dating. However, he can also have a no commitment meaning because he is blinded by the idea of love or by a perfect and fantasized version of his lover, so the love doesn't last when he realise the person is not conform with his dream.
knight of pentacles : i've seen him for stubbornness and someone materialistic, but very often it is about something that is progressing reeeeeeally slow, so it is frustrating. But i wouldn't say it is a bad card.
All and all i'd say the problem with the knight is that, expect with the knight of pentacles, their energy doesn't last so they can bring frustration. But it doesn't make them bad if you take them for what they are. And for example, if you begin a relationship described by knight of wands or cups, it doesn't mean you can transform the relationship in something else (if the other one is willing to of course).