HubPages.com is basically a content sharing site where you can write articles your like and earn some cash on 60-40 basis. HubPages.com is nothing but the outcome of Web 2.0 which is worth of your time online. People use HubPages mainly for the following reasons,

1. Drive Traffic to their website/blog.
2. Monetize and make some money out of the hubs they create.
3. Building Links and for good Search Engine Ranking.
4. Create a presence in the web

Few similar sites like squidoo, Ning, 43things, exists in the web but HubPages has definitely has got an edge over the others for the following reasons,

1. Web 2.0 interface which makes the publishing so smooth and simple.
2. Monetizing your hubs is so easy and has got facilities to track the same. eg) Adsense can be tracked used URL channels.
3. Easy to bring all your related hubs together using tags and groups.
4. There is no tag limitation in squidoo which makes your hub tied to wide range of tags.
5. HubPages referral system can bring more traffic to your hub. You will get 10% of page views of the referred person for your life.
6. Cashing up with HubPages is easy and you will be paid fast and you can make more money out of this site compared to others.
7. HubPages is new to the competition and you can make the most out of it as competition is relatively less.
8. No Adult contents are permitted in HubPages.
9. You can create hubs just by answering your fellow hubbers request and this will help you to create a community or network of your own easily.
10. Instantly tracking available for your traffic, earning etc which makes life easier.

At the same it has got some lacking features listed below compared to other sites,

1. No good WYSIWYG editor.
2. Unable to include extra HTML tags with the post which is possible with squidoo.
3. Very less customisation options.