I'm conflicted. Killzone 2 and 3 were incredible games, start to finish. Killzone ShadowFall was immense until after level 3 when it looked like they tried giving a horror a go (and did very well) but then ran out of ideas and just put you in a bullet storm.
Resistance I re-played recently aaaaaaaaanddddddddd it's just not a great game to be honest. I died so much because I couldn't jump over railings or certain fucking obstacles. Despite being able to clear the railings with a jump on some stairs, I still couldn't move past the invisible box and proceeded to get Auger'd from below and above. In the PS3 generation, I was very much about these games. Resistance 1 was a fun title, nothing ground breaking. Resistance 2 had a great multi-player and a sweet and sour story mode. Probably because of the pressure of being the 'Halo killer' that every PlayStation shooter (such as Haze) was. Resistance 3 confused me a bit at first because I thought Capelli looks nothing like this but the story turned out to be quite good. The multi-player this time round, was awful.
So if they bring Killzone back, it needs due care and attention. If they bring Resistance back, it needs to be impressive.
Honestly, I'd rather they get a really experienced team and give MAG another go.