Multiplayer uplifted games like halo, cod, and rainbow six.
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Have you played Halo: Combat Evolved? The multiplayer was just something they threw in on the side, an afterthought, the game itself is not only the longest and well designed one in the series, it also has a really freakin' awesome story that made me play it over and over again, there's more replay value in Halo: CE than any FPS ever made. Every game after that focused more and more on multiplayer, and the campaign took massive damage from it. If they had just left the multiplayer as is and kept it as an afterthought, the series would have been increasingly better, but instead they pulled all their people off of creating a good game, and forced them to make multiplayer.
What happened to telling a good story? What happened to developing more advanced A.I.? What happened to making the campaign?
I honestly tried to like multiplayer because I realized that the world around me was changing and good games were extinct, so naturally I gave it a shot and played some things online...I even tricked myself into thinking I liked it. After a little while I realized that not only was it extremely boring, but that there was no equality. If I killed someone it wasn't because I was better than them or just happened to do something they didn't expect, it was because (a) my internet speed is faster, (b) they were distracted by something else other than the game at that moment or (c) I got the drop on them and they didn't have a chance to begin with. The same reasons applied for when someone killed me, and after a week or two of this I stopped playing. I want to win because I'm strong, and I want to lose because I'm weak, I do not ever want to do either of those things because of some happenstance. It's how I am, and I will never change.
The campaign in any game allows for one to properly win or lose due to their performance alone, no outside force affects it. Every game I play, before I even start, I go to the options and set the difficulty on the hardest available...if the game is unbalanced and doesn't allow for anyone (no matter how good) to play at that level, then I find a difficulty that is challenging enough for me, but still provides the possibility of, at some point, being victorious. I want story, I want gameplay, I want difficulty...I want campaign, nothing else matters. A developer that cheats and tries to sell their multiplayer instead of their game is a failure. Multiplayer didn't make Halo: CE good, the campaign did, and that's the only game out of the series that actually carried itself, and that's the only game out of the series that made the series become so popular in the first place...