I remember Halo on the Xbox and how my friend and I rushed to play it through on co-op and had some fun with multiplayer. It's a fun game no doubt, but it's not the best thing ever. Once the excitement lowers, you quickly realize the similar environments and the replay value goes down for me. In fact, I found it very difficult to even play through the campaign again when I received Halo on the PC as a gift.
On the PC, Halo didn't stand up to the other great PC games. I would love to comment on the PC version of Halo 2, but Microsoft shot itself in the foot when they put the magic words of "Vista Only" in the title.
I wont refute Halo being a popular series or having good traits, but I will not call it the best thing since sliced bread.
On topic, I didn't think Resistance was that bad. The campaign had some cool moments, but I did get a little annoyed with how gun-ho Hale was that he'd rather go everywhere alone. Which kind of stinks because I think some of the coolest parts of the game are when there are lots of allies and enemies battling all around you.
I'm really looking forward to seeing what Insomniac have done with the finished product in Resistance 2. I don't want to set expectations too high to overhype it, but I do believe that the people of Insomniac are good enough game makers (based on just their PS3 games) to have Resistance 2 improving on the first Resistance in many ways, maybe even completely.