definitely one of the best series of games for the PS2.
Jak's main attacks are a spinning type of move and I don't know how to describe the other one, it's sort of like a quick punch. these moves can help out a lot. you'll also get to use different eco powers throughout the game. you'll find small amounts of eco or fountain type of thing that gives you a full amount until it runs out. the blue eco speeds Jak up and breaks open boxes around him as well as making scout flies and precursor orbs go to him. this will also help out with advancing farther because the blue eco activates certain things. red eco powers Jak up so he does more damage. yellow eco gives Jak the power to shoot powerful blasts which is really helpful when fighting a lot of enemies at once or harder enemies. it'll also help when you need to hit things that are farther away.
this is definitely one of those games that'll keep making you mad but the game isn't incredibly hard if you're used to playing this type of game. there's also many funny parts to the game so it isn't boring.
this game should definitely be considered a PS2 classic by now and for anyone that hasn't tried the series, it's worth playing. Jak is only 5 bucks at places like Gamestop so it's worth owning. as frustrating as Jak 2 and 3 are, they're worth playing after this one.