Does meditation giving you 'joy' because there is lack of suffering, or does it give something positive? Let's say that the summon of meditation is enlightement or nirvana. It is supposed to be a good 'thing'. But is it good because there is no suffering any more, or did you get something instead of it that is good in itself?
Both. Meditation when done properly will allow one to abandon the Five Hindrances (greed, anger, sloth/torpor, restlessness, doubt); and give rise to the Five Jhana Factors where each factor counters a particular hindrance:


Applied Examination to counter sloth/torpor
Sustained Examination to counter doubt
Joy to counter anger
Happiness to counter restlessness
One-pointedness to counter greed.


It's important to notice that meditation alone will not lead one to nibbana. It's only 1 out of 8 limbs of the Noble Eightfold Path, which a practioner will need to train to perfection.