Superb, the best way to be a zombie is not to act like a zombie. I always tried to tease the opponent out. You play mind games with them, you use their nervousness and then ambush them. It was all about hiding right underneath their noses while they had no idea where you are, because you don't just run directly at them and that confuses them. No shame in using your teammates as cannon fodder, hehe. I was a bigger lover of more classic Halo multiplayer, usually the vehicular combat side of things, my friend was a top notch driver and I could gun down anything with the gun, their defenses would melt away until someone got lucky with a rocket, laser or tank.
The best way to play with random teammates versus a party is to not coordinate at all, and instead just let them do what they're going to do anyway. They're going to run out and die like complete morons, and the best thing is to use that to your advantage. Let them die to their own stupidity while they unwittingly help either absorb bullets for you, or merely act as a distraction. The best thing about randoms, even with enemies, is (usually), they're so easy to psyche out, too. Inevitably, the other team is always much better than mine (
why am I always on the losing team?!), but generally speaking, the other team is still pretty stupid. Their behavior is usually very predictable. As a zombie, I hardly made an attempt to conceal my presence, unless I was sneaking up on someone. A lot of the time, it was beneficial they knew I was there, hiding around a corner, so long as I could get there without being gunned down. All I'd have to do is keep hiding, and eventually, either somebody would come for me and leave their little spot, and I'd be watching my radar for their red dot and make sure to swing right before they even appeared so that by the time I saw them, I was in mid swing (and typically, we'd both take the other out - but my job as a zombie was done by infecting them), or the other person would be smart enough not to go for my obvious trap, but in the latter case, I'd just be biding time until a sufficient amount of fodder zombies sprinted past to act as my shield to get up close to a target and munch down on them. It was a matter of numbers, whether I broke cover or not. I'm sure as fuck not popping out just to get shot, nor am I going to join just one other zombie so we both die, but if there was a few others, I'd join in too, and make sure to be right behind them. Still more than likely resulted in my death immediately after I got someone, but it was one less survivor at that point, and one more zombie, and that's all that mattered. And more often than not, I'd get more than one survivor, sometimes
three, if I got within range. I could never manage to last all that long as a survivor, but I had shit pretty damn figured out as a zombie. If I got infected fairly late into a round, chances are the other survivor or two might make it to the end, but if I was infected early on, or I started as a zombie, it was basically a guarantee that nobody was winning. Even in the event I was in fact the last survivor, which usually happened because I was hiding like a bitch somewhere in some obscure spot, my favorite thing to do was stand on the edge of a cliff and let the incoming horde get close to me, and then just jump off. Pretty much every time, everybody would jump off too after me, and the round would end with tons of people just falling to their deaths. I don't know why that was always so entertaining. See, in Big Team Battle, the most ironic thing is I hardly ever use vehicles, because for whatever reason, I always end up dying in them and not getting very many kills. But I enjoyed the large, open maps, I enjoyed the huge lobbies with large teams, and I enjoyed the added dynamic of vehicles, even if I was always on foot. I just liked the scale of things.