Dretchies doesn't have enough power comparing to rifle man. Dev server or normal 1.1 games - doesn't matter.
Goon range actually is a lot shorter but yeah, I don't like thing that it kills armored human with helmet with 2 chomps.
Adv.Mara need about 2 sec to kill human with arm/helm, also it has better jump (easy to stay on target and climb) and longer claw range.
Lisa gas can kill everything with good team (as you know, gas slows down hummans), also longer swipe, ability to health... should I say more?
//Damn I would like to post some demos to prove my rights but actually I don't have any. :s