Both modes feature two teams from which the Catchers has to catch the Runners by getting near them, turning them into Catchers as well. They both focus more on movement and maybe coordinated hunts than on actual shooting, even though it has its place in both modes.
In both modes the Catchers have initiative and resposibility of ending the round by catching everyone. If the catchers stand around, the Runners can just chill around as well.
Now what differentiates Infection from H&S is, the Catchers (Zombies in Infection) cannot shoot at all and need to body check the opposing team to catch them, while in H&S the Catchers can shoot and a hit only counts as a catch within a 2m radius. This enables the H&S Catchers to harass the Runners from afar by bumping them, making them fall and disturb their movement.
Also the Infection Zombies can die from Runner's rockets after two hits, while the H&S Catchers can be bumped around but never eliminated.
All in all the Infection Zombies have no offensive power whatsoever, which also denys them any Rocket Movement, and they also can easily die by opponent spam fire. Once you were caught, you become the most useless creature in the world, sucking any fun out of the rest of the round for you.
The only players who can move on the game are unmotivated and powerless.
In H&S the team which can move the game on, was actually the more powerful one, so after being caught (and more or less having lost the round) you do at least get an enhancement on for of the ability to eliminate people, and therefore new motivation and initiative. H&S is more balanced and therefore more fun.
The powerlessness of the Zombies in Infection also just provokes camping by the Runners, which is a lot campier than it was in H&S. Places the Zombies can't get to without rockets, the inability to bump people off OP high grounds like trees or to distract the Runners by spamming in their face or around their feet to bump them around.
Apart from the script there seem to be many problems with the Infection community that i never saw in H&S.
Just take a look at these "Rules for an Infection-Event".
1. This looks like those stupid SSM-Siege rules.xNero wrote:1. As survivor do NOT leave the map. By this I mean running away from the actual map so infecteds can not catch you or use glitches on the map to leave it.
2. As survivor do NOT go to any locations infecteds can not reach (like where you need rockets to get there). Its just not fair and ruins the game for other players. This also includes locations infecteds can not reach while you shoot them. (Like climbing on trees)
3. As most people do not like do NOT use your rocket to bump other players of buildings so they will get infected. (bumping other zombies is allowed :) )
Don't build breakable maps to begin with. In H&S , if a map was breakable, it was for everyone. There was a script side protection system so people couldn't leave the building area, so people couldn't just run off anyway.
2. This is a problem of the gamemode itself. If you realise that you need gentlemen's agreements to make mode playable, why don't you balance the mode? (Oh no sry, you would end up with an already existing one...)
3. It is a competitive mode. All Runners's goal is to be the last man standing. Why is playing AGAINST each other and therefore speeding up the round forbidden? Are the people playing Infection really such pussies that they cannot stand when someone outplays them? Again in H&S this "agreement" didn't need to exist, every Runner-Runner interaction was rather "social-experiment-esque", people chose for themselves if they wanna ally or fight each other.
Last but not least the H&S maps were a lot funnier, rewarding obstacling skills, not overloaded with bumpers. People did some crazy things with the Unlimiter back then, the maps were actual fun to me. The Infection maps I've seen so far were stupid.
I think people are only playing Infection because it's got Zombies in it. Hide and Seek sounds like a kid's game, I know. But people who are not willing to think about the modes they play and just go with what sounds/looks "cool", maybe kid's games are suitable for them anyway.
I tried to keep this short post, but meh, I wanted it to be clear as well. I'm not sure if I managed any of those two.