Resistance 2 is a mediocre game. Reviewers are often loathe to flat-out criticize a game that's competently executed; for some, another outing with bug-eyed aliens and Doom-inspired gameplay will be enough. But players need to demand and expect more from their games, even if it comes at the expense of polish. Insomniac assumes gamers will buy into tired gameplay because the package is shiny. Let's show them The Escapist is not a school of fish.
Bottom line: You've played this game before - many times before.
Recommendation: Don't buy this game.