Honestly, Jak 2's story ruined the game for me. Pissed me off far more than the Haven City parts.
Ratchet and Clank might be a bit more episodic in how its story is laid out but some of the cinemas in going commando simply put kicked ass. When I fire up GC I'll take time just to view its cinemas. This all leads up to a far more entertaining, clever, intelligent story. The characters, settings, situations, and themes are far more interesting to moi.
On the other hand, I think Jak 2 had a few parts where the gameplay out striped GC's, the problem though was the game was far more inconsistant and really dragged at times. The cinemas plain sucked. The story sucked. All of the characters, every last one of them suck. The situations the characters faced=Lameness.
GC is totally tight, fun the way those genesis games like Gunstar Heroes used to be but with the trimmings I expect from this era( and the 3dness of course).
November is going to rocksor for sho-sho. Prime 2, Halo 2, R and C 3...yup