Web 2.0 blogs are very powerful in generating unique backlinks, and boost your search engine ranking as most of the web 2.0 site's domain have huge authority and weight. It is not harder to rank web 2.0, the main thing is what are you publishing. Are you publishing content, video, image, tips,...etc?. If your content that you have written in your web 2.0 is quality content, then you can rank well. Create unique Title, Give proper search description and use appropriate proper tags relevant to your content. Use high quality with alt tag images.