It’s important to not judge your meditation. The only bad meditation is the one you don’t do! The truth is even when you have meditations that don’t feel as “good” or “powerful” as others, the light is still transforming you. It’s still working, even if it doesn’t feel like a good meditation to you. That being said you need to meditate correctly for it to really work, so please check out the post on meditating correctly, if you need a refresher.
For meditation instruction, download the free eBook on How to Meditate.