He has his moments, but he really is a selfish and simple boy that can come up with mildly clever strategies on the fly. I kind of enjoy that about his character, he doesn't have godlike foresight and isn't some master planner. Hell, this stupid brat got one of his hands blown off just because of moronic pride. That, and the whole situation where he went completely overboard with Pitou.
If it weren't for Killua, he would have died a long time ago, and he's completely aware of that.