Fuck people are really overreacting about this whole metacritic "debacle" first ps3-sales, Aldro, now you.
If Sony are still thinking that it will be the halo-killer then yes, they should drop it. If we are going only by review scores on metacritic then lol. After one game gets a 73 average we should drop the franchise? That's fucking crazy talk :D
Overall no, they should not, it's a franchise that averages around 2,5 million in sales, that's pretty big for Sony IPs. Shadow Fall looks like it will be the best selling entry, of course inflated by being a launch title but still doesn't change the fact. Plus Guerrilla is already working on another IP, they have 2 teams now, one should work on KZ the other on a new IP.
I haven't played SF yet, but for me personally I hope they won't. I like the setting, design, conflict and gameplay mechanics are easily my favourite for FPS shooter judging by KZ3 & and slightly lesser extent KZ2. Hope they didn't change it much for SF. I don't like the fact the they have gone for a more open mission structure, I would like it to stay linear.
If they would drop KZ, no big deal for me, just be sure to keep the shooting mechanics in your next game and I'll be there. If they would do a WW2 shooter though (empty market now, since CoD is not going back to WW2 anytime soon, and MoH being dead) drop KZ in a heartbeat.