It's nice to get comments, but they are not necessarily a measure of how much your hubs are liked. Hubbers are more likely to comment-- but outside viewers from the web are more likely to earn money for you, and less likely to comment.
It's good to review your hubs, but low numbers of comments don't mean lack of quality.
If you are writing mostly poetry, you may get fewer comments. It's not because your poetry is bad-- it just takes a certain reader to respond, and they may not be the majority.
Hang in there and keep writing.