As long as you don't get contaminated oats it's ok. Oats are rich in important B vitamins, zinc, iron, magnesium, protein and unsaturated fatty acids. BUT speak to your doctor before you decide.
No, that is a misconception. Gluten-free products sometimes have better nutritional value than traditional products. Pay particular attention to fibre, proteins and fat content.
The exception proves the rule - but not in this case! You must always follow a gluten-free diet, as your intestines and immune system will react to gluten, even if you don't feel it straightaway.