I play on a verity of servers.
I try to be careful about accusing people directly, as there are some good players out there, but I believe the overall trend of exceptional aim of human players is due to aimbots.
I am not trying brag when I say this, but I am very skilled at trem. I am extremely good at wall walking and with marauders. I have played games where I have taken on several humans by myself and won. I am also descent with humans, but i know how hard it can be to hit a dretch who really knows how to wall walk,
Here are some tricks that I have found to be somewhat useful when fighting aimbotters, hope they help.
1st of all, always assume they can see you, aimbotters often have wall hacks. You cant hide from a wall hack.
2nd, you have to learn to play in teams, since one of you is going to die in the assult (depending on your evolve), you need to at least make sure the other takes out the aimbot player. By continually taking out the aimboter you keep them using less devastating weapons.
3rd, watch out for groups of humans. 1 aimboter is deadly, 2 are leathal. only attack if you know that you can get your alien to saftey before he is killed, remembering that they just aren't going to miss you.
4rth, don't give into the aimboter taunting, they are usually the most arogant, cocky, and abnoxious players in the game. People who are honestly descent at tremulous, usually have a certain level of respect for their fellow players. Aimboters act like punks.
5th, remember that aimboters often are good at dodging to ( so are genuinely good players), because they don't have to worry about aiming, they can concentrate on other tasks.
6th, not every aimbotter is a noob. Some aimboters where good at tremulous before they started aimboting. People seem to think that only a noob would aimbot or use hacks, but that just isn't the case. In fact, if somebody is going to go searching for a hack, they have already probably played the game a bit.
7th. Don't waste your dragon on an aimboter by trying to chomp him. Your better of trying to pounce him and while you are poincing hold down the pounce button so that the minute you land on the ground you can pounce again to a safe location. With the right weapon, an aimboter can kill you rdragon in moments.
8th, the most devistating weapons an aimbot has is the shotgun, mass driver, rifle, chaingun, lase gun. Weapons that have high velocity, don't require much lead. When the aimboter is using a pulse rifle, if you keep you movement random and sparatic, it is much harder for them to hit you. That is due to the low velocity of the pulse rifle. Since the aimbot has a lead bot, by suddenly changing direction, their lead bot is worthless and can actually make them miss more often than if they weren't using an aimbot at all. If you are attacking with the marauder, you can take on aimbotter with a pulse rifle with out to much problem if you keep your marauder continually jumping of the walls and in new directions and over the aimboters head, they have a hard time hitting you because their leadbots predictions are off. But dont run or walk in a straight line, their lead bot can predict where you are going to be very easily.
9th, on servers that aren't unlaged, by keeping your movements sparatic, you can even make it hard for their aimbots to hit you even if they are using weapons with a high velocity.
10th, even if they aren't using an aimbot, just don't get in the habit of standing still. If a human can see you they can shoot you. You have have to stop make sure your behind something. There is no reason to go take a peak when playing aliens, you need to get used to using their radar. Remember, every alein can see through wall and obsticles, it makes no sense take a peak. You can count how many people there are by looking at the blue dots.
11th, a good time to attack an aimboter is when they have to turn their aimbot off. If an aimbot is headed towards your base, hide and wait until he start shooting stuff in your base. An aimboter will need to turn of his aimbot in order to shoot structures if oponents are around. This is because his aimbot will be pointing at you instead of the structure if he has it tied to his fire button. And for most aimbots, it will even point at you through walls, so he has to turn it off to shoot and acid tube or egg, etc. Good time to take him out since his aimbot is off.
12th, the best advice of all, is don't feed the aimboter. if you suspect he is aimboting, than don't play like you would other players. He would love nothing more than for you to charge him where he can just pick you off and feel he is such a good player. play hide and go seek. He can see you with his wall hack, and so he is going to get very frustrated when he is just sitting and staring at you through the wall. He just wants you to show yourself, just a little bit is all he needs. Well, when he comes closer to shoot you, run to the next corner and hide behind it. Just don't let the aimboter have his way, like I mentioned earlier, he will taunt you and call you names and may even get vulgar, but don't give in he is cheating anyways and doesn't deserve a fair fight that you would give an honest player. He may even discharge the magazine in his weapon out of frustrations, and if he does and needs to reload, then you have a window of opportunity to attack him without his aimbot being a problem.
I give this list of some tactics because we need to face the reality that people are aimboting and stop playing like they aren't. You can actually win against aimboters if you play like they are aimboters and get your team to play like they are aimboters.