I don't think you'll get judged mate, it's the big groups of car campers that have spoilt it. It's a real shame as it's a stunning place to spend a few days, the fact that it's only half an hour away from Glasgow doesn't do it any favours, as soon as the weather gets a bit warmer the place gets invaded every weekend.
I think the problems areas are the south east shores but I'm not really familiar with that area as we tend to paddle out from Aldochlay or Luss usually.
There are some nice camp spots up the northern end which the WHW trekkers use I think.
What's your plan anyway, are you hiking about or just setting up and chilling out for a few days ?