A few things regarding the next section of the guide. These are just rough notes, and I'm sure they could be more detailed.

Ninja Style:
In 1.2 the marauder is
the alien to attack the human base with simply because of its zap attack. As with any other time you attack, you should have the in-and-out, ninja mindset when attacking the humans' base. As stated above,
ALWAYS KEEP MOVING, especially in and around the human base. The turrets in 1.2 have a slower spin-up time, but once they settle on a target, they are unforgiving. If you get caught in a corner or in between structures for longer than a second or two, you will get shredded/zapped/gunned down. If you are lucky, you can hop in the human base, attack a few times, and hop back out whilst taking minimal damage.
For a full base:
For the most part, humans have learned to not cluster their buildings together. What they sometimes fail to consider, however, is themselves. Whenever there are two or more humans surrounding the armory (or in proximity to any other building really), you should consider zapping their sorry asses. This might not always bode well for your own health as the humans and their defences can easily attack you, but it can deal a lot of damage to multiple targets, as well as pave the way for other maras and/or other aliens to assault the human base.
For an empty base:
Although you won't have as many targets to zap at, you will have a lot less resistance from an empty human base. As usual, approach with caution. A nibble/zap here and there go a long way. It's best to assault with a basi (or booster) nearby and in groups, as you can run in, take a turret or two out, and then run out to heal. Keep an eye out for retreating or spawning humans.
Teslas:
Because of their knockback attack, it's best to approach with caution. The mara has a longer range (in terms of zap attack) then the tesla, so you should have no problem taking lone teslas out once you get comfortable with dancing just outside of their attack range. Never attack a tesla head on, as they will drain your health very quickly.
Attack in groups:
Two or more maras can take down a human base
very quickly with some goon/tyrant support. Always try to attack together, and (if possible) from different sides. Teamwork is essential. Attack what you think will yield the most damage. Suicide attacks are only advised if you think you can deal a decent amount of damage, otherwise keep attacking and then retreating to heal.