BASLICK!
That said, yes, save basilisk for when you're more experienced with the other aliens. However, know that the skills to being a good basilisk tie in heavily with dretch, more than anything in my opinion. Another important thing to know is that the basi grab slows turret turning, which is very useful. I've gone into the early human base many times and sat on the turrets easily headswiping humans from them because I kept looking at the turrets to slow them down.
As for marauder, try to balance out jumping and attacking while looking down a bit at their heads and fighting from the ground. A huge key to mara is learning how to headshot from the ground well.
And dragoon, the key is being quick to aim and quick to pounce. Just get used to ALWAYS being ready to pounce, or people who back away for a dance will own you, no questions asked. And with advanced dragoons, be careful of its larger size, it can be harder to maneuver through some areas. But, and I can't stress this enough, use snipes in combat whenever you feel you've got the time for it. They do massive damage on servers that aren't shit, and if you chomp them and then they run away you can usually still kill them with only one snipe after that. I've gotten good with sniping and it pays off huge to make those long range hits that piss people off.
EDIT: I forgot, listen to player1 on that pounce thing. Pounce has a decent range to hit people aside from your goon's actual body so when you're going at someone with it you keep your aim on them. And also, don't use marauder zap on humans with S2 armor stuff or battlesuits. It's not worth the risk. It's not even worth seriously using on S1 humans really, eating them is a lot faster and more efficient.
