I've played each GoW campaign at least 3 times now but would happily replay them if they got remasters similar to the first game.
I feel this. Haven't played them three times but I had so much fun playing all of them in sequence after I got my Xbox One. I had played 1 a long time ago in coop, which was great, but had never played the others.
The amazing thing about Gears is that, even though it's kinda the same thing over and over, the minute to minute shooting and combat feel so freaking good that you can just keep playing it. It's kinda like Halo in that regard, even though they play so differently. There's a perfect mechanical core to the game that's never really been replicated.
Maybe I'll replay them when Gears Next gets announced :)