I played and enjoyed Resistance 2, which I own. As the title says, I played this game for 15 minutes (or so). I know resistance 2 is the sequel, obviously. I wasn't expecting the games to be this different.
First of all, I didn't like the controls. They aren't horrible, just not very good. Another game that says "We aren't going to use CoD type controls, which are (almost) perfect, were going to be DIFFERENT". Of course, different means much, much worse.
Why I stopped playing after 15 minutes is that the game has a health bar. I don't remember if Resistance 2 had a health bar or not, but if it did, it didn't bother me. Health bars are outdated, annoying anachronisms. However, I can play a game that has them. The problem with Resistance 1 is that there are no health packs! Seriously! You play, you get shot a bit, you play some more and get shot some more until your health runs out and you die! Then you reload.