Sometimes you get sucky teammate but you can win anyway. I had a noob that went 0-15 three matches in a row and the only kills he got were team kills. He killed me three times but I'm not even mad.
I've said it before but I really think that splitscreen users should be banned from all modes except for co-op and TTDM. It's very common to see a splitscreen duo go 1-15/4-16 or similar and you need to have a least two beast players on the same team to make up for that.
Nope. Horrible idea. Splitscreeners contribute in the player pool, even if they suck.
If you don't like 'em, party up with competent players.