I would say more of the content then the comments since they are poor quality at times.
More like reviews are better to gauge what the value to a search engine it would be to it. Ones which are more than two sentences are more like it. heh!
Thanks for your opinion! Do you know it for sure or do you just think it? I want to spend a lot of time for the optimization of my blog, so I would like to read an opinion of someone who is very familiar with SEO and all other stuff around website and blog optimization for search engines.