Like most here, I believe the first Resistance was an excellent game, that blended WWII sensibilities with aliens to make something fresh and rather excellent. The sequel looses those elements and makes a rather generic game. The game itself is well made, the graphics are an upgrade over the previous one, the controls very tight, and some genuinely good boss fights make the experience well constructed. But there's feeling of something new or fresh, or even the feeling left with the first. Perhaps the creators thought it would be better to advance the game and make it more like other FPS, but in so doing they lost their special magic. I didn't like the limitation now placed on holding weapons. More often than not, I was using the same weapon the whole game to get through it, rather than using whatever weapon may be fun at the time. The story was more like Halo than the first game, and I was not thrilled with the ending.
Overall the game is well made, executed and everything is good on paper. If you're looking for a FPS in general you won't be disapointed, but if you're looking for an improvement on the original, you'll probably be disapointed.