The only J&D game I played from beginning to end was 2 and it was good (not outstanding, neither bad, just ok). As for the its difficulty, yes it was hard, but that was part of the charm, in a way… However, the final boss battle was pure torment, I remember failing so many times, again and again until my fingers were numb, but when finally defeated that gigantic metalhead… ahh, sweet, sweet VICTORY!
Wait, what?!!
I've played 1 and 3 with my cousin, but not the full thing, just random parts of the game. J&D 1 wasn't bad, but it got kinda boring really quick as it was repetitive with all that orb collecting and stuff. However, it was somewhat memorable… I remember a part where you had to catch fish for a guy, gather buffaloes for another guy, hatch a dino egg for somebody else, and other similar side quests…, and of course, how can I ever forget of the shark in the sea/ocean that swallows you whole if you swim too far, so similar to the one in R&C.
With J&D 3, it's a totally different story, that game was awesome, though sadly it was the one I had the fewest opportunities to actually play. Highlights: free roaming + desert cars, the blue angel wings power and the raptors you could ride (I had so much fun playing around with those by trying to climb on any possible building and more).
Oh, and Jak X, I remembered I played that too…. Well, blowing up cars was fun, but it definitely WASN'T a J&D game.
Ahh,… good old memories. I remember better what video games I played that actual "real life events".