Let's be honest. All three main Jak games were awesome. Sure, there are criticisms you can say against all three entries, but overall, each of them is a very good game.
Jak 1 - too short, and some of the dialogue / story was a bit too childish.
Jak 2 - too hard, and some of the ideas felt like they weren't fully fleshed out enough.
Jak 3 - definitely balance issues with some of the weapons / abilities, and many people didn't like the direction the story went.
But I do 100% agree with the TC on one thing though. Its a shame they never got a real sequel, but at this point, it's far too late.