Still making my way through the single player and I can't believe how good it is. This is easily on par if not better than Half-Life 2. It's that damn good. Oddly enough, it feels more like a PC FPS than a console game (with some Halo-like mechanics thrown in for good measure).
I just can't fathom how Insomniac pulled this off. They've been doing character based platform games for so many years and then to turn around and release an FPS that is as high quality as the best the genre has to offer at a system launch is just incredible.
I am also really impressed with the pacing. With both Half-Life 2 and the Halo games, there were most certainly segments that didn't do a whole lot for me. I loved to replay HL2, for instance, but there were certain chapters I would always skip as I just didn't care for them. The Halo games, of course, both had weak points as well. Most FPS games really do, when you stop and think about it. Yet, I can't point to a single segment in Resistance and label it as weak. The entire game has been 100% awesome. I replayed the first segments yesterday (up to the first stalker) as a friend wanted to see it, and I realized that the early stuff is actually very solid as well (and looks very nice too). The whole game is AAA and it only gets better.
Gears of War was really the same way. The game was literally perfect from start to finish (with the first chapter feeling weak during my first playthrough as well, only to discover later that it actually does kick ass). To receive two world class shooters in one month is just wonderful.
As a launch title, Resistance is every bit as good as Halo was back in 2001.