Good topic. I have a lot of minor issues with dog parks.. but we still take Eli to keep him socialized... so he doesnt end up like our other two.

When dogs like those come up to Eli and just wont leave him alone, he'll generally take care of it himself... He has this 'Gremlin' noise that he makes when someone is bothering him. He sits down, snaps at the other dog and then comes to J or I. Im not afraid of pushing a dog away from Eli if they were persistent. Or telling someone to take charge of their dog, if I knew who the correct owner was (usually dont though).

Our dog park has a sign with 10 or so rules.. No smoking, no children under 8 yr old, pick up your dog's crap, all must be spayed/neutered, no agressives, etc.
EVERY time we're there, someone is smoking. EVERY TIME... and there's no ashtrays.. because its not allowed.. so I wonder where all those spent cigarettes end up. On the ground maybe? ugh. Its disgusting. I'll make some loud disgusted comments and give some dirty looks in hopes that they stop.. sometimes they do.

Last couple of times there have been children, young children. These little kids run away from the dogs and cause a lot of problems. Also, Eli is afraid of them so its a whole other issue for us.. having to reassure Eli and keep him away from the kids.

The issue of Intact dogs bothers me too.. We took Eli once before we had him fixed, and I was hesitant to take him in because the sign said no.. He was never a humper though... but recently a lot of people have been bringing in specifically intact males.. that are very aggressive. Its like every time we go Eli has to fight off some excited male.. And last time we were there, there was a woman with three whippets (2 m, 1 f), all intact. And she just bragged and bragged about breeding them.. ugh. And how much she made of their puppies.

Its just so sad to see all these people that cannot read a sign... or just dont think the rules apply to them. Pfft.