Jak and Daxter is an excellent platformer, especially from the technical standpoint. 0 load times, fantastic animations, textures, special effects , draw distance, framerate etc.. all stand out.
The voice acting is tight, the storyline is decent for a platformer, I really cant find anything "wrong" with this game.
However it doesn't score a 10 IMO for a few reasons. 1 is the reliance on standard collect the coins gameplay. With all the technical innovation and creative level design there is a level of excellence that isn't realized in this core element. Collecting coins, or "ecco" is just stale.