jak ii being different isn't what makes it bad. it's the strange condescending attitude naughty dog had towards the platforming genre that made it bad. it affected basically everything about the game aside from the very few actual platforming segments and turned the game into a mess of a product.
"very few actual platforming segments"
1. Escape from fortress
2. Retrieve banner from Dead Town
3. Find pumping station valve
4. Blow up ammo at fortress
5. Destroy turrets in sewers
6. Rescue Vin at strip mine
7. Destroy eggs at drill platform
8. Find lens in Mountain Temple
9. Find gear in Mountain Temple
10. Find shard in Mountain Temple
11. Ride elevator up to palace
12. Protect site in Dead Town
13. Catch scouts in Haven Forest
14. Destroy equipment at dig
15. Drain sewers to find statue
16. Blow up strip mine eco wells
17. Get seal piece at dig
18. Use items in No Man's Canyon
19. Pass the first test of manhood
20. Pass the second test of manhood
21. Rescue friends in fortress
22. Destroy eggs in strip mine
23. Get Life Seed in Dead Town
24. Destroy drill platform tower
25. Explore palace
26. Get Heart of Mar in weapons lab
27. Find Sig in Underport
28. Escort Sig in Underport
"very few actual platforming segments"