Comment by dspillett

Any positive comment is fine, unless you are retorting to a negative one in which case you need to explain more.

If making a negative comment you should explain, i.e. "I think this is bad because ..." rather than "This is bad.". If you have a valid point you are helping by raising it.

Similarly when retorting to a negative point with a positive view, "I disagree because ... " is good but just "You are wrong." simply unhelpful noise.

So feel free to provide positive encouragement when you think something is awesome!