I would say, if i play on alien side, i dont get many kills as top players. Because i try to destoy humans base. There are certain amount of players, who get goon at s1 and only taking poor humies out with 1 hit. Those are players who complain "Campers wear pampers" or somthing. Camoon, idea of game is destroy opponents base, not getting kills.
Best example is Trains map with default base. All goons will be front of boxes, out of turrets range, and run down or up on emergency, almost noone goes to human base. They dont even try to destroy a turret, armory or react. But if humans stay and try to build base they say humies camp -.- Basicly, if someone complains "Humans camp" then answer "Well, destroy the base then".
Goons are killable at s1 by humans. 5 shots from shotgun and it is down, probably last 2 he will get on running out. So you must make 3 hits to goon while goon wont hit you - Its hard. To increase chanse, jump, you will get hit, but hey, you survive that hit. You get atleast 1 shot more. Second thing, dont be a hero, even a profi fails to solo goons most of the times. 2 humies with shotguns are even with a goon. If you succeed to both hit 2 times goon with shotgun, he is almost ded, even if one of you dies, another should get last shot and you both get more money then shotgun cost. 1 thing more. If you go in teams, let some space between you, most annoying thing is to be blocked with your teammate.
On alien side, if you are dretch, stay on walls at all the time. First thing, you dont block, second thing, its harder to hit you there, third thing you must get used to it. On aliens, humans are least of you worries. Lot of bigger alien kills are caused by other aliens, You cant get out of there by right time or just all aliens hit 1 humie at the same time and missed slashes hit your teamaliens. Weird thing is, most of times, adv goons run away, while normal goons try kill humans. Tyrants are allways problem, Dont rush all at once, you kill 1 turret and cant get over it, and must wait on rain of humans bullets. 1 after another, wait on safety 5-10 secs, look if you teammate dies and go or if he goes back, defend him. Remember, you must destroy opponents base, not opponents.
In average, aliens are a bit overpowered. Main cause is 1 hit kills. Normal dretch should make 2 headbites to kill unarmed human or 1 headbite and 2 bites to body to kill a human. With poison abity 1 headbite and 1 bodybite should make the thing. Goons shpuld do areound 80-90 damage per slash. So they cant kill human with 1 hit. Tyrants rush+slash should kill a turret and armed human, but battlesuiter needs 1 hit more.