> Anti-X sentiment takes a lot less effort than writing a cogent pro-X message supporting something

I would say that both take equally little effort to do lazy, and both take equally large effort to do good.

If someone goes around and say that windows version so and so has great battery time, a lazy response is to simply disagree with it. A good response looks for benchmarks and ask why said sources do not support the original commenter's arguments, and if the commenter himself/herself has any sources to support the claim.

The reverse is equally true, in that finding sources takes equally efforts no matter what point of view one try to share.