I had tried using Adwords on my business site but found I was paying more money than I was making. This is not a reflection on how good or bad it is. Obviously it works for many advertisers since Google is making good income from it.
In my case I found it difficult to fine-tune the filters to make sure my ads were being placed only on pages where it related well to the subject matter. That is the magic behind its power in advertising. You need to get your ads placed properly and Adwords gives you full control over that. But it takes a lot of work.
Note that Adwords is meant to be used to sell your products on your own business web site. There is no reason to consider using it for HubPages. For that matter, you can't! Since you have AdSense ads on Hubs that is a conflict of interest and against the rules.