Revenge would have been if the women tied the men up and went to their families(the men's families) all the while raping them, and when they arrive to each of the mens families they would slaughter them, that would have been revenge. Im not saying that im for that or that it is ok, i'm just saying that the women picking up the guns and shooting the men was a mercy killing for what they did to them in comparison.

I haven't seen this yet, but did any of those women offer to clean superman's apartment? Or make him a nice pie? Well then! I think there's your answer right there! What do you expect a man to do?

To me it's pretty simple. To quote roughly from "Kingdom Come", when you strip Superman down to his core, you find a man who doesn't want to see anyone die. He's upset Wonder Woman created a situation (not by letting the women out of the cages, but by leaving the guns rather conspicuously available) which was likely to result in death.
I understand the moral outrage of various people: it's not a black and white situation: but when it comes to death, Superman has always had a black and white view of the world, while Diana's (Wonder Woman's) has always been more "shades of grey" oriented.

No, but it annoyed me that he showed up to party with the rest of them despite having been totally ineffective. I think he's called the Man of Steel because he doesn't float.
(But I enjoyed the movie.)

Yeah, that sounds like Superman, all right. Well done.

doesn't care

Yeah, and he should prevent every crime and terrible thing everywhere. Why is it that he doesn't, do you think? Is it because he's lazy or doesn't care, perhaps?

he should have beaten the guys up for doing it to the women in the first place

He could have blasted Wonder Woman with some heat vision. You know, just a LITTLE bit of heat vision. Just to say, "Hey, I'm Superman. Don't forget it."

Yeah that would have made Wonder Woman see his point. Really Superman did the only thing he could, the deed had been done and he couldn't get her to accept his reasoning and he knew it. You might also notice the subtle change in Wonder Woman's facial expression as he leaves, she understood what he was saying and I think experienced some regret in what she did.
The last thing he'd ever do is attack her, as he said toward the end, she's his best friend.
You just going to stand there like a Lemon? Fable

agreed he should have beaten the beep out of them all for being so savage and ignorant
From the Islands of Hawaii to the Mountains of Canada, its the PINEAPPLE EXPRESS.

I was annoyed that Superman left the room with his tail between his legs.

You're missing the point. He wasn't suggesting that Diana should have left the women there, or that they didn't need rescuing, or anything like that. He was saying that her particular brand of vigilante justice was going too far, that they should have been punished according to the laws of the land, not through arbitrary revenge.
Laws exist to prevent exactly that sort of chaos and bloodshed. Just because those particular men probably deserved what they got doesn't make it right.