No, you're wrong!!!!
They make the game more exciting. It's like watching a movie or reading a book & your game is reading a book. Not even close. Like night & day.
Joking aside, it's really about personal opinion when it comes to animations in general.
And even amateur made is better than none!
When it's talented amateur work, sure.
When it's badly done and makes something that's supposed to look sexy come off as stilted and robotic, it's worse than nothing.
Adding animations for the sake of having them is pointless if they detract from the overall quality of the scene.
It's not like you need both hands free to masturbate, even if you somehow have a ridiculously above average dick size.