Is Buddhism Nihilistic?

I just finished reading Ajahn Brahm's book on Buddhist Meditation called *Mindfulness, bliss and beyond*. According to him, as per the Buddhist sutras, advancing in meditation you enter into jhanas, which has a component of bliss in it; this was fine. Then you enter immaterial realms, where he says even consciousness is impermanent. Even consciousness is a conditioned phenomena. And you enter realm of neither perception nor non-perception. After this you attain nibbana, blowing out, end of all. I have long held belief that you are consciousness, the witnessing. Hindus define ultimate attainment as truth, consciousness and bliss. So if even consciousness is not to be there -- and it's just literally nothing -- doesn't it just seem pointless? Your very attainment is pointless. Is it not better to roam this samsara doing good karma and enjoying the benefits? That way you at least live forever through rebirths. From this perspective, doesn't Buddha's teaching look Nilistic?