Is Google aware of comment spam?

I wrote a lot about gaining backlinks by commenting on blogs, and I always warn people that if you use this technique for link building, you have to deleiver real value as otherwise you are nothing but a spammer.
So what – a few people might think, then I am a spammer as long as google does not notice I am fine with that.
My opinion on those: You are wasting other people’s time and most probably your own time, too.
Read here what Google has to say about comment spam:
Google on comment spam