First time I've played any Jak and Daxter was on the PS3's HD collection and I loved the original. Went to Jak 2 right afterwards and I hated it. I didn't get to where you get guns or anything in the game. I got a mission or two into when you first join the resistance.
The problem with Jak 2 is that it's so monotonous and there's really no direction. Where you accept your next mission is as far as you can get from the exit/entrance so each mission is five minutes to walk there and back, then you go outside and you have no idea what you're really looking for so random wandering, until you find the item lying in the middle of nowhere. No map on outside areas to say, hey, go here and grab this.
I quit and haven't went back. I don't know if I'll ever play three because I have no plans on playing through the rest of the second.