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Jak 2 is a little crappy though. When I first played the game, it single handedly turned me off the rest of the series. I didn't even bother trying to play the other games until recently, and I trudged through Jak 2 just to get to Jak 3, and I don't regret it.
Saying something has "Charm" is just a cute way of saying it's lighthearted and kiddy.