I've seen splitscreeners end up the two two players before...though I should mention that I can only recall one time this happened :P..normally the results line up with the rest of the topic..though I still don't hate them..mildly dislike maybe.
me and my bro would play splitscreen in black ops 1 it was a blast i was the guy who played as guest and i would do pretty good like top 3 you guys are probably running into first time splitscreen guys.[aka a buddy sleeping over etc].black ops splitscreen zombies or online was a blast.
You have all probably been matched up with splitscreeners hundreds of times and never even knew it. Regardless if they were good or bad. I play splitscreen a lot with my buddies because, like others have said, I like to physically interact with my friends. We get together, have some drinks, watch some hockey/football, and play xbox. Thing is, we recover our gamertags. You’d never know we were playing on the same console. We all own our own houses, our own consoles, and our own copies of the game, but are guys who like to hang out. Sorry you internet geeks can stand the thought of going outside and having to physically interact with people.
I agree that those who play splitscreen do worse than they normally would because less screen, double sound effects and more distractions. But it doesn’t equal the worst players.
People just like to find any excuse they can for having a bad round. It happens, get over it.