I have played and to an extent enjoyed every Resistance games (cept for Burning skies since I don't have a Vita). I always felt that the core concept behind Resistance was awesome, and the Chimera are iconic and interesting enough to make fans want to learn more about them and their motives. I loved Hale and thought he was a badass. Buuut, I feel despite the cool concepts and interesting ideas, Insomniac kind of handled the series rather poorly imo. They changed the series around too much, not sure if they wanted to be something unique, or another Cod clone (see Killzone 3 -_-).
The last game was supposed to be the final chapter and be an actual ending. Instead of being a great conclusion it was a terrible punch line. The game was okay I guess, but for an ending, it was a huge let down. The gameplay itself was kind of I don't know, stale?