Is the NZXT H2 a real gaming case? Is it design for gaming? And how is it in terms of cooling
It can be used for a gaming rig, but is not designed exactly for gaming. I've been reading some reviews and most people say that the front intake fans are restricted by the front door and the foam, and the way the hard drives are mounted it's not ideal to fit large video cards.
But if you're using a single GPU and you add another fan you shouldn't have problems with airflow.