GSDs are usually a pain. They all seem very insecure around the other dogs. I can only think of two that actually play. Most of them just lunge and snap/bark at the other dogs. Wicked fun police. They sort of listen when you tell them to stop but only for a minute.
We've only had about 5 weimeranars but all they do is pace, pant, and drool or sometimes stress bark and try to scratch through the door.
Standard sized doodles. Most of them are very rude and in your face with the other dogs, several are severe humpers, and all of them won't shut up. They just bark and bark for no reason.
Huskies. I love huskies but hate having them in camp. They are all too rough, do not listen to you or the dogs, do not care about your yelling, water squirting, and attempts at intimidating body language, and think it's funny when the other dogs are afraid of them. They're either crazy all over the place bouncing off the walls or they're bullies. VERY few makes it through an entire day of camp without getting kicked out, at least for a nap. Oh, and they all dig on the water bowl and make the whole room a wet mess (we're an indoor facility).
Newfoundlands. Now I'm only basing this off of three dogs, they are regulars. They do not care about their size, they are way too rough. They like to smash other dogs up against walls. We have one that especially like to target small dogs (we put sturdy, playful little dogs like frenchies, some puggles, and similar sized mixes in with the big dogs). They tend to fixate on a dog and then are just relentless in trying to play with it whether he likes it or not. Just constant following, barking, pushing, nipping, will not leave that poor dog alone. And they are nearly impossible to stop. Shouting doesn't even get an ear flick, if I try to body block they just stand there or push me aside. Trying to pull the dog away is very difficult because of their size. Squirt bottle gets a very slight response if you really load it in their face, but that's about it and all it gets you is a very seconds of peace.
And pretty much all of our chocolate labs eat poop, though they vary in how ravenous they are about it. Not to say other breeds don't. Our three most notorious poop eaters are a chocolate lab, a yellow lab, and a GSD. Oh and most pugs eat poop too.
I can't think of any breed that walks in and makes me instantly worried as far as aggression goes. Though I can usually tell by looking at a dog in the lobby if they're going to be iffy. They just hold themselves very stiffly or have a very tense face or something.