Yes, you're basically right. No Limit Poker thrives on aggressive play and you can win lots of small pots by playing aggressively and pushing your opponents out of the pot even though you haven't hit anything. But crazy maniacs will lose in the long run. He often gets himself into bad situations by constantly playing over his hands. Above all, he loses large pots and runs against monsters. Basically, you should only play with good hands. Furthermore, you should pay attention to the position, as playing in position is much more profitable.