If I understand source code well, wearing light armor drains 4 stamina ... per second, I think. I think the time unit was not specified.
However, campersuit does not drain stamina at all unless you jump or sprint.
Nothing in trem is faster than the marauder. Especially once you learn to use walls.
I know some walljumping shortcuts which can save you 20ish seconds.
But walls are your doom on many maps. It depends on map design. Marauders especially hate diagonal walls (like those near elevator room on Kalith). Additionaly, some maps have lots of snags to annoy marauders. For example... ugh... the name with glass pipe, I think it's Nexus. If you're attacking human base in starting position, only 1 entrance is viable for you, because the other has awful lot of snags AND diagonal walls. The entrance path leading from bridge over glass pipe is a marauder deathzone unless you have bigger aliens with you.
Dretches may walk faster but marauders jump; they jump high and they jump fast.
And precisely because they jump high (and no way around it) they can be very vulnerable to snags on many maps. I'd love to have an ability for smaller, lower jumps with marauder.
Marauders can kill battlesuits, not easy but hey we're talking about a stage 2 alien versus a stage 3 armor.
Sure they can, it just takes awful amount of time. Sometimes, if a campersuit is retreating and backpedaling, it's a good idea to NOT jump and stand in it's way. Zap is good because it doesn't care if it hits legs. This makes job easier for other aliens.
About stage 2 vs stage3:
ever noticed that humans aren't affected by such sentiments ? Many tyrants and dragoons have been machinegunned. Stage2 (i think) flamer burns adv dragoons and tyrants just fine. I've killed many dragoons and tyrants with shotgun. A painsaw can easily kill several buildings before aliens realize what's going on... some people can kill aliens well with it. Stage2 pulse rifle is good against everything - buildings, small aliens, big aliens; it just sucks at long range. And how about stage1 chaingun ? Does it suck ?
What I don't like about aliens is that they're very inflexible, each alien has its pros and cons, while almost all human weapons are good at range and used in similar way. Humans can easily change equipment, aliens - only to higher evolution. Humans have no problem evolving to builder.
By the way, if anyone's listening, aliens should be allowed evolving to granger if they're very close to egg. This would make them more flexible while preventing dretch-granger abuse and making adv.granger pointless.
The only thing that is needed is experience on them. I even prefer them over goons and tyrants for base destruction. Every alien class needs experience and I understand that it's hard to get but once mastered marauders can easily outmatch humans even when they're in groups.
I've been playing basically only marauders for last 2 months or something, if it tells you something.
Marauders have their upsides, but they need some breathing room. They suck in tight, twisted corridors; in places with diagonal walls, and lots of snags. They make you lose momentum, and being close to wall is dangerous ( especially lucy and flamer). A bit more open spaces and longer corridors make them shine.